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A002931 as a simple table

n a(n)
1 0
2 1
3 2
4 7
5 28
6 124
7 588
8 2938
9 15268
10 81826
11 449572
12 2521270
13 14385376
14 83290424
15 488384528
16 2895432660
17 17332874364
18 104653427012
19 636737003384
20 3900770002646
21 24045500114388
22 149059814328236
23 928782423033008
24 5814401613289290
25 36556766640745936

[0,1,2,7,28,124,588,2938,15268,81826,449572,
 2521270,14385376,83290424,488384528,2895432660,
 17332874364,104653427012,636737003384,
 3900770002646,24045500114388,149059814328236,
 928782423033008,5814401613289290,
 36556766640745936]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)