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A081050 as a simple table

na(n)
01
10
25
35
474
5154
62484
78028
8149904
9663696
1014257440
1180627040
121965444480
1313575738240
14370643938560
153031488633600
1691657072281600
17867718162483200
1828779361764249600
19309920046408806400
2011185850044938240000

[1,0,5,5,74,154,2484,8028,149904,663696,14257440,
 80627040,1965444480,13575738240,370643938560,
 3031488633600,91657072281600,867718162483200,
 28779361764249600,309920046408806400,
 11185850044938240000]