A325808 - OEIS

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A325808 as a simple table

n	a(n)
1	1
2	6
3	28
4	120
5	259
6	496
7	8128
8	18990
9	667296
10	1858939
11	2097414
12	2383279
13	4843717
14	33550336
15	150588313
16	186695863
17	188908297

[1,6,28,120,259,496,8128,18990,667296,1858939, 2097414,2383279,4843717,33550336,150588313, 186695863,188908297]