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A147908 as a simple table

n a(n)
1 1
2 2
3 6
4 16
5 74
6 368
7 1776
8 9208
9 53466
10 314212
11 2033052
12 13601690
13 101992918
14 775253990
15 6502888210
16 55177455836

[1,2,6,16,74,368,1776,9208,53466,314212,2033052,
 13601690,101992918,775253990,6502888210,
 55177455836]

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Last modified January 23 17:33 EST 2022. Contains 350514 sequences. (Running on oeis4.)