A208402 - OEIS

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A208402 as a simple table

n	a(n)
1	2
2	15
3	187
4	2795
5	43947
6	700075
7	11188907
8	178973355
9	2863377067
10	45813246635
11	733008800427
12	11728128223915
13	187650001250987
14	3002399818689195
15	48038396293720747
16	768614337478306475
17	12297829386768001707

[2,15,187,2795,43947,700075,11188907,178973355, 2863377067,45813246635,733008800427, 11728128223915,187650001250987,3002399818689195, 48038396293720747,768614337478306475, 12297829386768001707]