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A170220 as a simple table

na(n)
01
119
2342
36156
4110808
51994544
635901792
7646232256
811632180608
9209379250944
103768826516992
1167838877305856
121221099791505408
1321979796247097344
14395636332447752192
157121453984059539456

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