A016989 - OEIS

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A016989 as a simple table

n	a(n)
0	0
1	40353607
2	20661046784
3	794280046581
4	10578455953408
5	78815638671875
6	406671383849472
7	1628413597910449
8	5416169448144896
9	15633814156853823
10	40353607000000000
11	95151694449171437
12	208215748530929664

[0,40353607,20661046784,794280046581, 10578455953408,78815638671875,406671383849472, 1628413597910449,5416169448144896, 15633814156853823,40353607000000000, 95151694449171437,208215748530929664]