A097582 - OEIS

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A097582 as a simple table

n	a(n)
1	1
2	15
3	234
4	3412
5	50664
6	1022634
7	13331215
8	206636142
9	3026236221
10	614636352655
11	155123512633260
12	35001313215554565
13	10403265603212022112
14	2132066345452131466644
15	434014101450663623262042

[1,15,234,3412,50664,1022634,13331215,206636142, 3026236221,614636352655,155123512633260, 35001313215554565,10403265603212022112, 2132066345452131466644,434014101450663623262042]