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A180070 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 12
5 44
6 116
7 374
8 1428
9 5960
10 26016
11 120570
12 590598
13 3065372
14 16566508
15 92827128
16 542485764
17 3298228302
18 20696614200 

[1,1,2,6,12,44,116,374,1428,5960,26016,120570,
 590598,3065372,16566508,92827128,542485764,
 3298228302,20696614200]

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Last modified March 6 04:14 EST 2021. Contains 341841 sequences. (Running on oeis4.)