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A002740 as a simple table

na(n)
00
10
20
32
415
584
6420
71980
89009
940040
10175032
11755820
123233230
1313728792
1457946200
15243374040
161017958725
174242920400
1817631691440
1973078721100
20302202005490
211247182879800
225137916074200
2321132472200840
2486794082253450
25356013544661424
261458583920435600
275969389748449400

[0,0,0,2,15,84,420,1980,9009,40040,175032,755820,
 3233230,13728792,57946200,243374040,1017958725,
 4242920400,17631691440,73078721100,302202005490,
 1247182879800,5137916074200,21132472200840,
 86794082253450,356013544661424,1458583920435600,
 5969389748449400]