A211040 - OEIS

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A211040 as a simple table

n	a(n)
1	1
2	4
3	40
4	928
5	45128
6	4945168
7	1207742160
8	655725571768
9	791701825710768
10	2127149017683661104
11	12717092443922120808584
12	169157473880575759274475472
13	5006302388939519643670779061032

[1,4,40,928,45128,4945168,1207742160,655725571768, 791701825710768,2127149017683661104, 12717092443922120808584, 169157473880575759274475472, 5006302388939519643670779061032]