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A274985 as a simple table

na(n)
00
10
21
36
458
5948
625992
71179016
887713040
910646068080
102101395344400
11673242645670320
12349671381118477440
13294206779308703578240
14400822226102433353285760
15883965927408694948620295680
163155212287401150653204012531200

[0,0,1,6,58,948,25992,1179016,87713040,
 10646068080,2101395344400,673242645670320,
 349671381118477440,294206779308703578240,
 400822226102433353285760,
 883965927408694948620295680,
 3155212287401150653204012531200]