A003281 - OEIS

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A003281 as a simple table

n	a(n)
0	0
1	1
2	23
3	1477
4	555273
5	38466649
6	1711814393
7	48275151899
8	28127429172349
9	11820256380127
10	61330815490787739
11	1438084556561535649
12	3452174145433606905
13	1300912433743549667989
14	275638998008835888305243

[0,1,23,1477,555273,38466649,1711814393, 48275151899,28127429172349,11820256380127, 61330815490787739,1438084556561535649, 3452174145433606905,1300912433743549667989, 275638998008835888305243]