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A206639 as a simple table

n a(n)
0 1
1 1
2 4
3 18
4 91
5 489
6 2751
7 15985
8 95218
9 578324
10 3568084
11 22299964
12 140885754
13 898292262
14 5772951668
15 37355908797
16 243184468271
17 1591567315702
18 10465836784159
19 69114490893596
20 458171948148640
21 3047865264442504
22 20339282134624054
23 136122586785459512

[1,1,4,18,91,489,2751,15985,95218,578324,3568084,
 22299964,140885754,898292262,5772951668,
 37355908797,243184468271,1591567315702,
 10465836784159,69114490893596,458171948148640,
 3047865264442504,20339282134624054,
 136122586785459512]

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Last modified April 25 07:41 EDT 2024. Contains 371964 sequences. (Running on oeis4.)