A020568 - OEIS

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A020568 as a simple table

n	a(n)
0	1
1	27
2	499
3	7863
4	113731
5	1561647
6	20724139
7	268611543
8	3422947891
9	43073421567
10	536871293179
11	6642406690023
12	81708636139651
13	1000502412972687
14	12206022852156619
15	148472243708301303

[1,27,499,7863,113731,1561647,20724139,268611543, 3422947891,43073421567,536871293179,6642406690023, 81708636139651,1000502412972687,12206022852156619, 148472243708301303]