A317986 - OEIS

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A317986 as a simple table

n	a(n)
1	13
2	37
3	89
4	277
5	821
6	2465
7	7389
8	22161
9	66469
10	199389
11	598165
12	1794469
13	5383413
14	16150225
15	48450673
16	145352013
17	436056017
18	1308168049
19	3924504145

[13,37,89,277,821,2465,7389,22161,66469,199389, 598165,1794469,5383413,16150225,48450673, 145352013,436056017,1308168049,3924504145]