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A316955 as a simple table

n a(n)
1 4
2 32
3 220
4 1498
5 10243
6 70037
7 478941
8 3275421
9 22400407
10 153196114
11 1047708300
12 7165282183
13 49003412145
14 335134684958
15 2291988565129
16 15674926737950
17 107200940180870
18 733148025596363
19 5014004790884386
20 34290816000118746

[4,32,220,1498,10243,70037,478941,3275421,
 22400407,153196114,1047708300,7165282183,
 49003412145,335134684958,2291988565129,
 15674926737950,107200940180870,733148025596363,
 5014004790884386,34290816000118746]

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Last modified December 7 17:42 EST 2023. Contains 367659 sequences. (Running on oeis4.)