A028175 - OEIS

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A028175 as a simple table

n	a(n)
0	1
1	31
2	612
3	9842
4	140903
5	1874733
6	23747074
7	290631904
8	3469802325
9	40674188555
10	470287309856
11	5380934171886
12	61072079752867
13	688801372689097
14	7730331225654558
15	86417957138887388
16	963072515157938129

[1,31,612,9842,140903,1874733,23747074,290631904, 3469802325,40674188555,470287309856,5380934171886, 61072079752867,688801372689097,7730331225654558, 86417957138887388,963072515157938129]