A160128 - OEIS

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A160128 as a simple table

n	a(n)
0	3
1	7
2	19
3	63
4	235
5	919
6	3651
7	14575
8	58267
9	233031
10	932083
11	3728287
12	14913099
13	59652343
14	238609315
15	954437199
16	3817748731
17	15270994855
18	61083979347
19	244335917311
20	977343669163
21	3909374676567
22	15637498706179

[3,7,19,63,235,919,3651,14575,58267,233031,932083, 3728287,14913099,59652343,238609315,954437199, 3817748731,15270994855,61083979347,244335917311, 977343669163,3909374676567,15637498706179]