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A220381 as a simple table

n a(n)
1 4
2 25
3 136
4 753
5 4160
6 22989
7 127037
8 702009
9 3879313
10 21437148
11 118462034
12 654623158
13 3617458391
14 19990134860
15 110465815644
16 610435923087
17 3373279000591
18 18640795512630
19 103009344107857
20 569231338133692

[4,25,136,753,4160,22989,127037,702009,3879313,
 21437148,118462034,654623158,3617458391,
 19990134860,110465815644,610435923087,
 3373279000591,18640795512630,103009344107857,
 569231338133692]

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Last modified November 29 04:38 EST 2021. Contains 349416 sequences. (Running on oeis4.)