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A080227 as a simple table

n a(n)
0 0
1 0
2 1
3 3
4 13
5 65
6 391
7 2737
8 21897
9 197073
10 1970731
11 21678041
12 260136493
13 3381774409
14 47344841727
15 710172625905
16 11362762014481
17 193166954246177
18 3477005176431187
19 66063098352192553
20 1321261967043851061
21 27746501307920872281
22 610423028774259190183

[0,0,1,3,13,65,391,2737,21897,197073,1970731,
 21678041,260136493,3381774409,47344841727,
 710172625905,11362762014481,193166954246177,
 3477005176431187,66063098352192553,
 1321261967043851061,27746501307920872281,
 610423028774259190183]

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Last modified August 4 03:57 EDT 2021. Contains 346442 sequences. (Running on oeis4.)