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A081902 as a simple table

na(n)
01
19
266
3434
42661
515525
687240
7475920
82534400
913227520
1067866624
11343105536
121712390144
138449622016
1441273524224
15199782039552
16959119884288
174570314964992
1821629992173568
19101729521631232
20475697692803072

[1,9,66,434,2661,15525,87240,475920,2534400,
 13227520,67866624,343105536,1712390144,8449622016,
 41273524224,199782039552,959119884288,
 4570314964992,21629992173568,101729521631232,
 475697692803072]