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A001854 as a simple table

n a(n)
1 0
2 2
3 15
4 148
5 1785
6 26106
7 449701
8 8927192
9 200847681
10 5053782070
11 140679853941
12 4293235236324
13 142553671807729
14 5116962926162738
15 197459475792232725
16 8152354312656732976
17 358585728464893234305
18 16741214317684425260142
19 826842457727306803110997
20 43073414675338753123113980

[0,2,15,148,1785,26106,449701,8927192,200847681,
 5053782070,140679853941,4293235236324,
 142553671807729,5116962926162738,
 197459475792232725,8152354312656732976,
 358585728464893234305,16741214317684425260142,
 826842457727306803110997,
 43073414675338753123113980]

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Last modified October 19 12:07 EDT 2018. Contains 316360 sequences. (Running on oeis4.)