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A277370 as a simple table

n a(n)
1 1
2 3
3 15
4 69
5 2155
6 34073
7 876047637
8 97090036327
9 420397381695
10 2125899832395
11 3177544777277
12 34434175473881
13 40845965389135

[1,3,15,69,2155,34073,876047637,97090036327,
 420397381695,2125899832395,3177544777277,
 34434175473881,40845965389135]

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Last modified May 25 19:30 EDT 2020. Contains 334595 sequences. (Running on oeis4.)