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A031973 as a simple table

n a(n)
0 1
1 2
2 7
3 40
4 341
5 3906
6 55987
7 960800
8 19173961
9 435848050
10 11111111111
11 313842837672
12 9726655034461
13 328114698808274
14 11966776581370171
15 469172025408063616
16 19676527011956855057
17 878942778254232811938
18 41660902667961039785743
19 2088331858752553232964200

[1,2,7,40,341,3906,55987,960800,19173961,
 435848050,11111111111,313842837672,9726655034461,
 328114698808274,11966776581370171,
 469172025408063616,19676527011956855057,
 878942778254232811938,41660902667961039785743,
 2088331858752553232964200]

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Last modified June 5 12:47 EDT 2020. Contains 334840 sequences. (Running on oeis4.)