A153992 - OEIS

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A153992 as a simple table

n	a(n)
0	1
1	2
2	4
3	16
4	64
5	447
6	3366
7	48406
8	708304
9	19960973
10	570218721
11	31360806160
12	1749984725579
13	187910820807765
14	20470104106684190
15	4283194032962518137

[1,2,4,16,64,447,3366,48406,708304,19960973, 570218721,31360806160,1749984725579, 187910820807765,20470104106684190, 4283194032962518137]