A028150 - OEIS

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A028150 as a simple table

n	a(n)
0	1
1	31
2	614
3	9926
4	142995
5	1915077
6	24414088
7	300588892
8	3608146949
9	42498447563
10	493420114122
11	5665664143698
12	64496965543063
13	729264545514289
14	8201673484111916
15	91847355888191144
16	1025058980614782537

[1,31,614,9926,142995,1915077,24414088,300588892, 3608146949,42498447563,493420114122,5665664143698, 64496965543063,729264545514289,8201673484111916, 91847355888191144,1025058980614782537]