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A143523 as a simple table

n a(n)
0 1
1 3
2 10
3 42
4 248
5 1992
6 19600
7 222288
8 2851712
9 41075328
10 658359040
11 11621260032
12 223832419328
13 4669549335552
14 104894256056320
15 2524539033397248
16 64811332658757632
17 1767891945806266368
18 51060500413513400320

[1,3,10,42,248,1992,19600,222288,2851712,41075328,
 658359040,11621260032,223832419328,4669549335552,
 104894256056320,2524539033397248,
 64811332658757632,1767891945806266368,
 51060500413513400320]

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Last modified January 31 04:27 EST 2023. Contains 359947 sequences. (Running on oeis4.)