A219813 - OEIS

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A219813 as a simple table

n	a(n)
1	15
2	45
3	377
4	2179
5	11395
6	62341
7	358480
8	2042977
9	11133454
10	57524941
11	283686403
12	1346514989
13	6179034469
14	27460498749
15	118362882158
16	495874680973
17	2023906766644
18	8063298364234
19	31401504048785
20	119663290195459

[15,45,377,2179,11395,62341,358480,2042977, 11133454,57524941,283686403,1346514989,6179034469, 27460498749,118362882158,495874680973, 2023906766644,8063298364234,31401504048785, 119663290195459]