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A076901 as a simple table

n a(n)
0 1
1 1
2 1
3 4
4 21
5 96
6 520
7 3795
8 32053
9 284368
10 2763876
11 30648465
12 373339824
13 4833294389
14 67167087793
15 1009753574739
16 16215467043493
17 275361718915824
18 4947532173402532
19 94054153646919213
20 1882793796608183356
21 39528099512321898363
22 869222284280777733043

[1,1,1,4,21,96,520,3795,32053,284368,2763876,
 30648465,373339824,4833294389,67167087793,
 1009753574739,16215467043493,275361718915824,
 4947532173402532,94054153646919213,
 1882793796608183356,39528099512321898363,
 869222284280777733043]

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Last modified June 4 11:22 EDT 2024. Contains 373096 sequences. (Running on oeis4.)