A027393 - OEIS

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A027393 as a simple table

n	a(n)
0	1
1	6
2	51
3	526
4	6261
5	83670
6	1232335
7	19742190
8	340632825
9	6281417350
10	123031916475
11	2546554829550
12	55463580338125
13	1266494279875350
14	30225798507297975
15	751874518736980750
16	19447447965603896625

[1,6,51,526,6261,83670,1232335,19742190,340632825, 6281417350,123031916475,2546554829550, 55463580338125,1266494279875350,30225798507297975, 751874518736980750,19447447965603896625]