Challenge: sum of squares. Let's break 299

[Allen]

Here's one for 300:

(264, 265, 219, 181, 260, 269, 172, 228, 256, 273, 211, 230, 170, 271, 258, 226, 174, 267, 262, 179, 221, 263, 266, 175, 225, 259, 270, 214, 227, 257, 272, 128, 196, 288, 241, 200, 284, 292, 237, 204, 280, 296, 233, 208, 276, 300, 229, 255, 274, 210, 231, 298, 278, 206, 235, 294, 282, 202, 198, 243, 286, 290, 151, 173, 268, 261, 180, 144, 297, 279, 205, 236, 293, 283, 201, 240, 289, 287, 242, 199, 162, 238, 291, 285, 244, 197, 203, 281, 295, 234, 207, 277, 252, 232, 209, 275, 254, 187, 213, 148, 176, 224, 217, 183, 178, 222, 139, 185, 299, 142, 182, 218, 223, 177, 147, 253, 188, 212, 112, 249, 192, 169, 155, 245, 239, 161, 163, 126, 130, 194, 247, 153, 171, 190, 251, 149, 140, 184, 216, 145, 111, 250, 191, 98, 127, 129, 195, 246, 154, 135, 121, 168, 156, 133, 123, 166, 158, 131, 125, 164, 160, 96, 193, 248, 152, 137, 119, 50, 146, 215, 109, 87, 138, 186, 103, 122, 134, 91, 105, 120, 136, 89, 167, 157, 132, 124, 72, 97, 159, 165, 60, 84, 141, 220, 69, 100, 189, 67, 102, 94, 75, 150, 106, 90, 79, 117, 108, 88, 81, 115, 110, 86, 83, 113, 143, 82, 114, 55, 66, 78, 118, 51, 93, 76, 68, 53, 116, 80, 64, 57, 43, 101, 95, 74, 70, 99, 45, 36, 85, 59, 41, 40, 104, 92, 52, 48, 73, 71, 29, 35, 65, 56, 44, 77, 23, 26, 38, 62, 107, 37, 63, 58, 42, 39, 61, 20, 16, 33, 31, 18, 46, 54, 10, 6, 19, 30, 34, 47, 17, 32, 49, 15, 1, 8, 28, 21, 4, 5, 11, 14, 2, 7, 9, 27, 22, 3, 13, 12, 24, 25)