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A061690 as a simple table

n a(n)
1 0
2 0
3 6
4 72
5 650
6 5400
7 43757
8 353192
9 2862330
10 23352300
11 191891117
12 1587587760
13 13215894133
14 110619113423
15 930376519256
16 7858437064232
17 66627124896218
18 566791391339532
19 4836144006188165
20 41375938305568772
21 354859541163656045

[0,0,6,72,650,5400,43757,353192,2862330,23352300,
 191891117,1587587760,13215894133,110619113423,
 930376519256,7858437064232,66627124896218,
 566791391339532,4836144006188165,
 41375938305568772,354859541163656045]

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Last modified March 28 13:21 EDT 2024. Contains 371254 sequences. (Running on oeis4.)