A183427 - OEIS

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A183427 as a simple table

n	a(n)
1	27
2	129
3	2097
4	62694
5	568053
6	9465579
7	153369936
8	2690956971
9	45874334853
10	796531210974
11	13594653632997
12	236054009534571
13	4119252539173344
14	72199869938810379
15	1270404732873196197
16	22433067829384669998

[27,129,2097,62694,568053,9465579,153369936, 2690956971,45874334853,796531210974, 13594653632997,236054009534571,4119252539173344, 72199869938810379,1270404732873196197, 22433067829384669998]