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A166922 as a simple table

na(n)
01
10
21
32
410
548
6276
71768
812552
997408
10818704
117396384
1271380640
13732058880
147943068992
1590833753728
161091134058624
1713728139694080
18180436251140352
192471790031618560

[1,0,1,2,10,48,276,1768,12552,97408,818704,
 7396384,71380640,732058880,7943068992,90833753728,
 1091134058624,13728139694080,180436251140352,
 2471790031618560]