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A057407 as a simple table

n a(n)
13 2
14 36
15 366
16 2832
17 18666
18 110724
19 609922
20 3182038
21 15931446
22 77253554
23 365240626
24 1691895678
25 7707586246
26 34630458076
27 153803559514
28 676416563354
29 2949990640350
30 12772844235264
31 54957447470264

[2,36,366,2832,18666,110724,609922,3182038,
 15931446,77253554,365240626,1691895678,7707586246,
 34630458076,153803559514,676416563354,
 2949990640350,12772844235264,54957447470264]

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Last modified September 25 18:27 EDT 2022. Contains 356986 sequences. (Running on oeis4.)