A166965 - OEIS

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A166965 as a simple table

n	a(n)
0	1
1	19
2	316
3	5104
4	81856
5	1310464
6	20970496
7	335540224
8	5368692736
9	85899280384
10	1374389272576
11	21990231506944
12	351843716694016
13	5629499517435904
14	90071992480301056
15	1441151880490123264
16	23058430091063197696

[1,19,316,5104,81856,1310464,20970496,335540224, 5368692736,85899280384,1374389272576, 21990231506944,351843716694016,5629499517435904, 90071992480301056,1441151880490123264, 23058430091063197696]