HP49-50G plotting of sum(x=0 to 0, 1, 2,...10, of x!/(2x)!)

[Gil]

I want to plot the function, for x=integer,

Y= sum (from x=0 to 0, of x! / (2x)!) [1st point]
Y= sum (from x=0 to 1, of x! / (2x)!) [2nd point]
Y= sum (from x=0 to 2, of x! / (2x)!) [3rd point]
...
Y= sum (from x=10 to 0, of x! / (2x)!) [11th point]

in order to see how this series converges
to about 1.7364.

Basically, the program is
« 0 0 X
FOR i i ! SQ 2 i * ! / +
NEXT
»
and Range X goes from 0 to 11.

For each intermediary step (before NEXT command), I want the corresponding value yi to be drawn (point xi, yi).

How should I procede to enter Y1=...?

Thanks in advance for your kind help.

Regards,
Gil