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A156291 as a simple table

n a(n)
1 1
2 3
3 8
4 21
5 104
6 315
7 105
8 1040
9 5355
10 19344
11 3255
12 125840
13 1826055
14 15107664
15 86590175
16 9765
17 880880
18 23738715
19 317260944
20 2684295425
21 16476602400
22 1240155
23 962801840
24 129637122615
25 6196423497264
26 150285647959475
27 2261529015616800

[1,3,8,21,104,315,105,1040,5355,19344,3255,125840,
 1826055,15107664,86590175,9765,880880,23738715,
 317260944,2684295425,16476602400,1240155,
 962801840,129637122615,6196423497264,
 150285647959475,2261529015616800]

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Last modified July 17 02:10 EDT 2019. Contains 325092 sequences. (Running on oeis4.)