A145241 - OEIS

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A145241 as a simple table

n	a(n)
1	1
2	3
3	27
4	189
5	3969
6	64827
7	3179169
8	121272795
9	13891861179
10	1237840901829
11	331231632520635
12	68946329439933309
13	43098014529769439457
14	20956433266778185286019
15	30601694853748262964093129

[1,3,27,189,3969,64827,3179169,121272795, 13891861179,1237840901829,331231632520635, 68946329439933309,43098014529769439457, 20956433266778185286019, 30601694853748262964093129]