A028173 - OEIS

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A028173 as a simple table

n	a(n)
0	1
1	31
2	615
3	9995
4	145511
5	1981731
6	25867375
7	328390315
8	4092662871
9	50378487731
10	614988087935
11	7465359578235
12	90280175113831
13	1089001243414531
14	13113567724769295
15	157729903649607755

[1,31,615,9995,145511,1981731,25867375,328390315, 4092662871,50378487731,614988087935,7465359578235, 90280175113831,1089001243414531,13113567724769295, 157729903649607755]