A170364 - OEIS

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A170364 as a simple table

n	a(n)
0	1
1	19
2	342
3	6156
4	110808
5	1994544
6	35901792
7	646232256
8	11632180608
9	209379250944
10	3768826516992
11	67838877305856
12	1221099791505408
13	21979796247097344
14	395636332447752192
15	7121453984059539456

[1,19,342,6156,110808,1994544,35901792,646232256, 11632180608,209379250944,3768826516992, 67838877305856,1221099791505408,21979796247097344, 395636332447752192,7121453984059539456]