A111817 - OEIS

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A111817 as a simple table

n	a(n)
0	1
1	4
2	28
3	524
4	29804
5	5423660
6	3276048300
7	6744720496300
8	48290009081437356
9	1221415413140406958252
10	110523986015743458745929900
11	36150734459755630877180158951596

[1,4,28,524,29804,5423660,3276048300, 6744720496300,48290009081437356, 1221415413140406958252, 110523986015743458745929900, 36150734459755630877180158951596]