A048667 - OEIS

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A048667 as a simple table

n	a(n)
1	1
2	12
3	198
4	3604
5	69405
6	1386048
7	28403620
8	593399416
9	12584663901
10	270123960220
11	5855607723702
12	127986261470436
13	2952216605926965
14	62378907950601228
15	1388516401122627270

[1,12,198,3604,69405,1386048,28403620,593399416, 12584663901,270123960220,5855607723702, 127986261470436,2952216605926965, 62378907950601228,1388516401122627270]