A300920 - OEIS

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A300920 as a simple table

n	a(n)
1	1
2	40
3	290
4	4066
5	48588
6	640673
7	8265835
8	108469760
9	1419225976
10	18612718736
11	243965442778
12	3199006474569
13	41943406467118
14	549970038257539
15	7211211285768759
16	94554378260472599
17	1239807002239604003

[1,40,290,4066,48588,640673,8265835,108469760, 1419225976,18612718736,243965442778,3199006474569, 41943406467118,549970038257539,7211211285768759, 94554378260472599,1239807002239604003]