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A126409 as a simple table

n a(n)
0 1
1 22
2 104
3 500
4 2418
5 11736
6 57098
7 278274
8 1357980
9 6633780
10 32433110
11 158676010
12 776746680
13 3804116478
14 18638153276
15 91348350296
16 447842953212
17 2196139279248
18 10771787471680
19 52844083573174
20 259283266049208

[1,22,104,500,2418,11736,57098,278274,1357980,
 6633780,32433110,158676010,776746680,3804116478,
 18638153276,91348350296,447842953212,
 2196139279248,10771787471680,52844083573174,
 259283266049208]

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Last modified August 10 14:50 EDT 2020. Contains 336381 sequences. (Running on oeis4.)