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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 April 24 14:54 EDT 2024. Contains 371960 sequences. (Running on oeis4.)