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A018955 as a simple table

n a(n)
2 1
3 13
4 28
5 270
6 1176
7 7952
8 43772
9 285525
10 1808560
11 12186394
12 82828916
13 578556693
14 4088706356
15 29246505510
16 210592755064 

[1,13,28,270,1176,7952,43772,285525,1808560,
 12186394,82828916,578556693,4088706356,
 29246505510,210592755064]

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Last modified May 25 10:05 EDT 2022. Contains 354066 sequences. (Running on oeis4.)