A007781 - OEIS

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A007781 as a simple table

n	a(n)
0	1
1	3
2	23
3	229
4	2869
5	43531
6	776887
7	15953673
8	370643273
9	9612579511
10	275311670611
11	8630788777645
12	293959006143997
13	10809131718965763
14	426781883555301359
15	18008850183328692241
16	808793517812627212561

[1,3,23,229,2869,43531,776887,15953673,370643273, 9612579511,275311670611,8630788777645, 293959006143997,10809131718965763, 426781883555301359,18008850183328692241, 808793517812627212561]