A012068 - OEIS

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A012068 as a simple table

n	a(n)
0	1
1	3
2	49
3	1963
4	146017
5	17450227
6	3064381137
7	744091967643
8	239039270010305
9	98237724213189475
10	50300088100727103345
11	31409480786365735560715
12	23501653583412713065987105
13	20761459048626350764508502355

[1,3,49,1963,146017,17450227,3064381137, 744091967643,239039270010305,98237724213189475, 50300088100727103345,31409480786365735560715, 23501653583412713065987105, 20761459048626350764508502355]