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A007856 as a simple table

n a(n)
1 1
2 3
3 12
4 52
5 236
6 1109
7 5366
8 26639
9 135300
10 701269
11 3700400
12 19834973
13 107784622
14 592705377
15 3292970302
16 18458954896
17 104276682820
18 593056996445
19 3392898090908
20 19512100041995
21 112729617387020
22 653965783541960
23 3807766434556940

[1,3,12,52,236,1109,5366,26639,135300,701269,
 3700400,19834973,107784622,592705377,3292970302,
 18458954896,104276682820,593056996445,
 3392898090908,19512100041995,112729617387020,
 653965783541960,3807766434556940]

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Last modified January 26 17:31 EST 2020. Contains 331280 sequences. (Running on oeis4.)