A048709 - OEIS

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A048709 as a simple table

n	a(n)
0	1
1	27
2	325
3	7607
4	69649
5	1749419
6	22103317
7	476952263
8	4311744769
9	116417108763
10	1392727114821
11	32619053820599
12	300171238899985
13	7506480532757163
14	94597931458646037
15	2049660569696039367

[1,27,325,7607,69649,1749419,22103317,476952263, 4311744769,116417108763,1392727114821, 32619053820599,300171238899985,7506480532757163, 94597931458646037,2049660569696039367]