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A218940 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 30
5 154
6 1429
7 11065
8 148817
9 1667697
10 29103894
11 396571224
12 10450152905
13 172658168937 

[1,1,2,6,30,154,1429,11065,148817,1667697,
 29103894,396571224,10450152905,172658168937]

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Last modified June 10 13:04 EDT 2024. Contains 373264 sequences. (Running on oeis4.)