A020969 - OEIS

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A020969 as a simple table

n	a(n)
0	1
1	27
2	493
3	7611
4	107293
5	1432011
6	18457741
7	232505307
8	2883927805
9	35398400235
10	431393410669
11	5231599117563
12	63232056214237
13	762504498009099
14	9180490786688077
15	110414131486397979
16	1326988747136473789

[1,27,493,7611,107293,1432011,18457741,232505307, 2883927805,35398400235,431393410669,5231599117563, 63232056214237,762504498009099,9180490786688077, 110414131486397979,1326988747136473789]