A018952 - OEIS

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A018952 as a simple table

n	a(n)
2	2
3	6
4	33
5	202
6	1042
7	6206
8	38572
9	252894
10	1685564
11	11367911
12	77773792
13	538226451
14	3755728475
15	26423241960
16	187316098603

[2,6,33,202,1042,6206,38572,252894,1685564, 11367911,77773792,538226451,3755728475, 26423241960,187316098603]

[2,6,33,202,1042,6206,38572,252894,1685564,
 11367911,77773792,538226451,3755728475,
 26423241960,187316098603]