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A251688 as a simple table

na(n)
01
11
225
361
4336
51200
63600
713500
832400
9118800
10259200
11939600
121944000
136998400
1413996800
1550155200
1697977600
17349920000
18671846400
192393452800
204534963200
2116124313600
2230233088000
23107327462400
24199538380800
25707454259200
261306069401600
274625662464000
288489451110400

[1,1,25,61,336,1200,3600,13500,32400,118800,
 259200,939600,1944000,6998400,13996800,50155200,
 97977600,349920000,671846400,2393452800,
 4534963200,16124313600,30233088000,107327462400,
 199538380800,707454259200,1306069401600,
 4625662464000,8489451110400]