A229931 - OEIS

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A229931 as a simple table

n	a(n)
1	15
2	4679
3	575757
4	78416265
5	10521395805
6	1411363459757
7	189537122520529
8	25452175156264451
9	3417529000078202173
10	458884977133199962799
11	61616812650798586337473
12	8273590477515811155826013

[15,4679,575757,78416265,10521395805, 1411363459757,189537122520529,25452175156264451, 3417529000078202173,458884977133199962799, 61616812650798586337473,8273590477515811155826013]