A263335 - OEIS

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A263335 as a simple table

n	a(n)
1	7
2	19
3	57
4	409
5	2047
6	10747
7	70423
8	427507
9	2610075
10	16811257
11	106973797
12	685280521
13	4472908837
14	29110775719
15	191077482297
16	1268190506821
17	8394627812935
18	56013012538219
19	376887163063705
20	2528646896288971

[7,19,57,409,2047,10747,70423,427507,2610075, 16811257,106973797,685280521,4472908837, 29110775719,191077482297,1268190506821, 8394627812935,56013012538219,376887163063705, 2528646896288971]