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A150423 as a simple table

n a(n)
0 1
1 2
2 7
3 24
4 96
5 390
6 1640
7 7003
8 30629
9 135960
10 610766
11 2762496
12 12597678
13 57882821
14 267706394
15 1243964373
16 5803343475
17 27181577787
18 127811261317
19 602994481450
20 2852581142432
21 13527290314262
22 64302155624496
23 306367818206171
24 1462679856613386
25 6995553173184415
26 33511988966326965
27 160793288870253855

[1,2,7,24,96,390,1640,7003,30629,135960,610766,
 2762496,12597678,57882821,267706394,1243964373,
 5803343475,27181577787,127811261317,602994481450,
 2852581142432,13527290314262,64302155624496,
 306367818206171,1462679856613386,6995553173184415,
 33511988966326965,160793288870253855]

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Last modified December 3 18:07 EST 2022. Contains 358536 sequences. (Running on oeis4.)