A125865 - OEIS

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A125865 as a simple table

n	a(n)
0	1
1	6
2	51
3	651
4	13131
5	435801
6	24530016
7	2394413286
8	412135908606
9	126722253316281
10	70336222713070656
11	71088278975389204986
12	131802456226253519662956
13	451158681817567800972000111

[1,6,51,651,13131,435801,24530016,2394413286, 412135908606,126722253316281,70336222713070656, 71088278975389204986,131802456226253519662956, 451158681817567800972000111]