A130531 - OEIS

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A130531 as a simple table

n	a(n)
0	1
1	3
2	20
3	300
4	7816
5	309268
6	17129124
7	1257440728
8	117670533312
9	13632858981520
10	1911496421824368
11	318509331241411392
12	62137611331237184232
13	14017177497096182047312
14	3617854328162898879096264

[1,3,20,300,7816,309268,17129124,1257440728, 117670533312,13632858981520,1911496421824368, 318509331241411392,62137611331237184232, 14017177497096182047312,3617854328162898879096264]