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A183721 as a simple table

n a(n)
1 0
2 1
3 12
4 87
5 537
6 3070
7 16731
8 88331
9 455804
10 2311983
11 11571209
12 57295330
13 281223411
14 1370286715
15 6635743136
16 31964799247
17 153273890393
18 732031932806
19 3483896304443
20 16529018119643
21 78202676604548
22 369073777749215

[0,1,12,87,537,3070,16731,88331,455804,2311983,
 11571209,57295330,281223411,1370286715,6635743136,
 31964799247,153273890393,732031932806,
 3483896304443,16529018119643,78202676604548,
 369073777749215]

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Last modified December 3 01:25 EST 2022. Contains 358510 sequences. (Running on oeis4.)