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A031972 as a simple table

n a(n)
0 0
1 1
2 6
3 39
4 340
5 3905
6 55986
7 960799
8 19173960
9 435848049
10 11111111110
11 313842837671
12 9726655034460
13 328114698808273
14 11966776581370170
15 469172025408063615
16 19676527011956855056
17 878942778254232811937
18 41660902667961039785742
19 2088331858752553232964199

[0,1,6,39,340,3905,55986,960799,19173960,
 435848049,11111111110,313842837671,9726655034460,
 328114698808273,11966776581370170,
 469172025408063615,19676527011956855056,
 878942778254232811937,41660902667961039785742,
 2088331858752553232964199]

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Last modified December 14 22:42 EST 2019. Contains 329987 sequences. (Running on oeis4.)