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A181950 as a simple table

n a(n)
1 1
2 1
3 4
4 19
5 91
6 571
7 4096
8 38599
9 370399
10 3771751
11 40020916
12 486887611
13 6457566259
14 97397627419
15 1566407932636
16 25622476773391
17 416792928270751
18 7346982309720079
19 141863542111338124
20 2968348473040595971
21 65223378275792128771
22 1460499016109864574691
23 32600807940657384926884

[1,1,4,19,91,571,4096,38599,370399,3771751,
 40020916,486887611,6457566259,97397627419,
 1566407932636,25622476773391,416792928270751,
 7346982309720079,141863542111338124,
 2968348473040595971,65223378275792128771,
 1460499016109864574691,32600807940657384926884]

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Last modified February 15 21:12 EST 2019. Contains 320138 sequences. (Running on oeis4.)