A012958 - OEIS

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A012958 as a simple table

n	a(n)
0	1
1	4
2	104
3	6694
4	801048
5	153856794
6	43323364476
7	16817632212294
8	8608497639495696
9	5618149971940668018
10	4553225539309052888516
11	4486447408838286577963006
12	5281810573883783813034431960

[1,4,104,6694,801048,153856794,43323364476, 16817632212294,8608497639495696, 5618149971940668018,4553225539309052888516, 4486447408838286577963006, 5281810573883783813034431960]