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A147902 as a simple table

n a(n)
1 1
2 2
3 6
4 16
5 74
6 304
7 1424
8 6554
9 36720
10 207648
11 1262922
12 7739400
13 57383696
14 429424444
15 3331954076
16 26331934036

[1,2,6,16,74,304,1424,6554,36720,207648,1262922,
 7739400,57383696,429424444,3331954076,26331934036]

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Last modified January 16 19:48 EST 2022. Contains 350376 sequences. (Running on oeis4.)