A165341 - OEIS

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A165341 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	209379250773
10	3768826510836
11	67838877139815
12	1221099787522476
13	21979796157509076
14	395636330513044512
15	7121453943436661808

[1,19,342,6156,110808,1994544,35901792,646232256, 11632180608,209379250773,3768826510836, 67838877139815,1221099787522476,21979796157509076, 395636330513044512,7121453943436661808]