A012851 - OEIS

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A012851 as a simple table

n	a(n)
0	1
1	1
2	25
3	1225
4	108113
5	15283505
6	3167087273
7	904365439289
8	340377095938337
9	163284306442648801
10	97251848546749385145
11	70412470931263247515689
12	60905917762268697815507057
13	62032377805368358044198610705

[1,1,25,1225,108113,15283505,3167087273, 904365439289,340377095938337,163284306442648801, 97251848546749385145,70412470931263247515689, 60905917762268697815507057, 62032377805368358044198610705]