A020726 - OEIS

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A020726 as a simple table

n	a(n)
0	1
1	27
2	493
3	7599
4	106645
5	1411431
6	17955757
7	222093423
8	2690508229
9	32080473975
10	377794514461
11	4405195463487
12	50953884924853
13	585473143132359
14	6690087028209805
15	76090252032830991
16	861988540696279717

[1,27,493,7599,106645,1411431,17955757,222093423, 2690508229,32080473975,377794514461,4405195463487, 50953884924853,585473143132359,6690087028209805, 76090252032830991,861988540696279717]