A180757 - OEIS

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A180757 as a simple table

n	a(n)
1	0
2	13
3	31
4	658
5	8840
6	141313
7	2141384
8	33329847
9	514990479
10	7988200496
11	123822198215
12	1920693558801
13	29793765165720
14	462205529321051
15	7170401050696078
16	111238701384104135
17	1725707750909016718

[0,13,31,658,8840,141313,2141384,33329847, 514990479,7988200496,123822198215,1920693558801, 29793765165720,462205529321051,7170401050696078, 111238701384104135,1725707750909016718]