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A147900 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 2134376
12 14852630
13 117199526
14 945570742
15 8407963796
16 76231574308

[1,2,6,16,74,368,1776,9208,53466,314212,2134376,
 14852630,117199526,945570742,8407963796,
 76231574308]

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Last modified January 19 18:36 EST 2022. Contains 350466 sequences. (Running on oeis4.)