A087178 - OEIS

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A087178 as a simple table

n	a(n)
1	1
2	4
3	106
4	630
5	26185
6	178666
7	8991709
8	3678166249
9	28031525940
10	13143231877116
11	824038411943548
12	6585233816779471
13	427212999940414402
14	230740449590738871715
15	128696758387000610268418

[1,4,106,630,26185,178666,8991709,3678166249, 28031525940,13143231877116,824038411943548, 6585233816779471,427212999940414402, 230740449590738871715,128696758387000610268418]