A304764 - OEIS

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A304764 as a simple table

n	a(n)
1	0
2	61
3	609
4	14831
5	316639
6	6978743
7	153265405
8	3370551763
9	74123574757
10	1630186115855
11	35852814076173
12	788517491160890
13	17342027096153103
14	381406953690484427
15	8388366572399262975
16	184487188445903163586

[0,61,609,14831,316639,6978743,153265405, 3370551763,74123574757,1630186115855, 35852814076173,788517491160890,17342027096153103, 381406953690484427,8388366572399262975, 184487188445903163586]