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A161731 as a simple table

n a(n)
0 1
1 5
2 26
3 138
4 740
5 3988
6 21544
7 116520
8 630544
9 3413072
10 18476960
11 100032672
12 541583936
13 2932214080
14 15875537536
15 85953303168
16 465368899840
17 2519604954368
18 13641675037184
19 73858930936320
20 399887996969984

[1,5,26,138,740,3988,21544,116520,630544,3413072,
 18476960,100032672,541583936,2932214080,
 15875537536,85953303168,465368899840,
 2519604954368,13641675037184,73858930936320,
 399887996969984]

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Last modified March 28 15:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)