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A136469 as a simple table

n a(n)
0 1
1 4
2 36
3 972
4 82692
5 22668224
6 20480767016
7 62399482333360
8 654732295896172624
9 24092174555680443592896
10 3156168229958886081384337440
11 1490220874303979634022445823087616

[1,4,36,972,82692,22668224,20480767016,
 62399482333360,654732295896172624,
 24092174555680443592896,
 3156168229958886081384337440,
 1490220874303979634022445823087616]

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Last modified September 28 06:57 EDT 2021. Contains 347703 sequences. (Running on oeis4.)