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A003161 as a simple table

n a(n)
0 1
1 1
2 2
3 9
4 36
5 190
6 980
7 5705
8 33040
9 204876
10 1268568
11 8209278
12 53105976
13 354331692
14 2364239592
15 16140234825
16 110206067400
17 765868074400
18 5323547715200
19 37525317999884
20 264576141331216
21 1886768082651816
22 13458185494436592
23 96906387191038334
24 697931136204820336

[1,1,2,9,36,190,980,5705,33040,204876,1268568,
 8209278,53105976,354331692,2364239592,16140234825,
 110206067400,765868074400,5323547715200,
 37525317999884,264576141331216,1886768082651816,
 13458185494436592,96906387191038334,
 697931136204820336]

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Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)