A161370 - OEIS

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A161370 as a simple table

n	a(n)
0	3
1	7
2	27
3	159
4	1267
5	12663
6	151947
7	2127247
8	34035939
9	612646887
10	12252937723
11	269564629887
12	6469551117267
13	168208329048919
14	4709833213369707
15	141294996401091183
16	4521439884834917827
17	153728956084387206087

[3,7,27,159,1267,12663,151947,2127247,34035939, 612646887,12252937723,269564629887,6469551117267, 168208329048919,4709833213369707, 141294996401091183,4521439884834917827, 153728956084387206087]