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A019061 as a simple table

n a(n)
2 4
3 2
4 14
5 160
6 900
7 4886
8 30682
9 192510
10 1224950
11 7984182
12 52634438
13 351382520
14 2369835680
15 16119973510
16 110532124292

[4,2,14,160,900,4886,30682,192510,1224950,7984182,
 52634438,351382520,2369835680,16119973510,
 110532124292]

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Last modified May 24 23:50 EDT 2024. Contains 372782 sequences. (Running on oeis4.)