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A018960 as a simple table

n a(n)
2 2
3 9
4 43
5 185
6 1068
7 5908
8 33711
9 201908
10 1252537
11 8093382
12 54041010
13 367349280
14 2519993244
15 17358556116
16 119812418022

[2,9,43,185,1068,5908,33711,201908,1252537,
 8093382,54041010,367349280,2519993244,17358556116,
 119812418022]

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)