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A290581 as a simple table

n a(n)
1 1
2 20
3 364
4 7028
5 148752
6 3471192
7 89097664
8 2503362488
9 76575071488
10 2536513162508
11 90532686154752
12 3465845396598540
13 141726054915248128
14 6167370619705004144
15 284635248765764878336
16 13889365886508877963184
17 714612366728939248091136
18 38667882915659893417754820
19 2195406208657284278474506240
20 130509259754593318496376665060
21 8107405596523654695095077175296
22 525358015896796804145274761270600

[1,20,364,7028,148752,3471192,89097664,2503362488,
 76575071488,2536513162508,90532686154752,
 3465845396598540,141726054915248128,
 6167370619705004144,284635248765764878336,
 13889365886508877963184,714612366728939248091136,
 38667882915659893417754820,
 2195406208657284278474506240,
 130509259754593318496376665060,
 8107405596523654695095077175296,
 525358015896796804145274761270600]

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Last modified July 21 21:14 EDT 2019. Contains 325199 sequences. (Running on oeis4.)