A278431 - OEIS

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A278431 as a simple table

n	a(n)
1	40
2	1609
3	57760
4	2116789
5	67971132
6	1796061464
7	39513263094
8	743248079740
9	12242795030458
10	179948822861856
11	2394561544941994
12	29174653111810701
13	328380943500399272
14	3439574456695348801
15	33729578625174035514

[40,1609,57760,2116789,67971132,1796061464, 39513263094,743248079740,12242795030458, 179948822861856,2394561544941994, 29174653111810701,328380943500399272, 3439574456695348801,33729578625174035514]