A126456 - OEIS

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A126456 as a simple table

n	a(n)
0	1
1	5
2	55
3	1330
4	58905
5	4187106
6	437353560
7	63140314380
8	12049276177620
9	2938311614386005
10	891655291709643461
11	329600203128234828790
12	145830232567505064233200
13	76102715775896720790887700

[1,5,55,1330,58905,4187106,437353560,63140314380, 12049276177620,2938311614386005, 891655291709643461,329600203128234828790, 145830232567505064233200, 76102715775896720790887700]