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A219456 as a simple table

n a(n)
1 20
2 26
3 498
4 3422
5 27967
6 197308
7 1324860
8 8405212
9 51417327
10 303703636
11 1731421125
12 9525742325
13 50654533963
14 260914306516
15 1304341448963
16 6337774514024
17 29964888604613
18 137989085373438
19 619551753355165

[20,26,498,3422,27967,197308,1324860,8405212,
 51417327,303703636,1731421125,9525742325,
 50654533963,260914306516,1304341448963,
 6337774514024,29964888604613,137989085373438,
 619551753355165]

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Last modified December 6 16:26 EST 2021. Contains 349567 sequences. (Running on oeis4.)