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A026651 as a simple table

n a(n)
2 1
3 9
4 40
5 240
6 915
7 5103
8 18704
9 101952
10 368490
11 1990890
12 7154928
13 38514528
14 138086403
15 742202055
16 2658662560
17 14283407616
18 51156225342
19 274842096462
20 984532674800
21 5291030979360
22 18960255044654
23 101937273452454
24 365451691152864

[1,9,40,240,915,5103,18704,101952,368490,1990890,
 7154928,38514528,138086403,742202055,2658662560,
 14283407616,51156225342,274842096462,984532674800,
 5291030979360,18960255044654,101937273452454,
 365451691152864]

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Last modified September 20 03:32 EDT 2019. Contains 327209 sequences. (Running on oeis4.)