A007134 - OEIS

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A007134 as a simple table

n	a(n)
1	1
2	1
3	4
4	35
5	541
6	13302
7	489287
8	25864897
9	1910753782
10	193328835393
11	26404671468121
12	4818917841228328
13	1167442027829857677
14	374059462390709800421
15	158311620026439080777076

[1,1,4,35,541,13302,489287,25864897,1910753782, 193328835393,26404671468121,4818917841228328, 1167442027829857677,374059462390709800421, 158311620026439080777076]