A204679 - OEIS

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A204679 as a simple table

n	a(n)
1	2
2	15
3	159
4	2191
5	31168
6	447343
7	6427791
8	92387812
9	1327953799
10	19087798375
11	274365294336
12	3943689122935
13	56686048473223
14	814797524429284
15	11711788424726319
16	168343648648695295
17	2419748633865949120

[2,15,159,2191,31168,447343,6427791,92387812, 1327953799,19087798375,274365294336,3943689122935, 56686048473223,814797524429284,11711788424726319, 168343648648695295,2419748633865949120]