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A266490 as a simple table

n a(n)
0 1
1 1
2 4
3 20
4 126
5 972
6 8876
7 93580
8 1119328
9 14986944
10 222184136
11 3614288272
12 64022264176
13 1226914925840
14 25295189791296
15 558317369479616
16 13136590271813856
17 328243850207690432
18 8680766764223956416
19 242245419192494844096
20 7113910552105144027136
21 219304957649505551899136
22 7081169542830272102170752
23 238996807468258679150596352

[1,1,4,20,126,972,8876,93580,1119328,14986944,
 222184136,3614288272,64022264176,1226914925840,
 25295189791296,558317369479616,13136590271813856,
 328243850207690432,8680766764223956416,
 242245419192494844096,7113910552105144027136,
 219304957649505551899136,
 7081169542830272102170752,
 238996807468258679150596352]

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Last modified May 17 05:13 EDT 2021. Contains 343965 sequences. (Running on oeis4.)