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A180900 as a simple table

na(n)
11
25
335
4265
52100
617075
7141246
81182719
99994086
1085049639
11727865758
126257933219
1354010196582
14467657712902
154060558796894
1635341693437365
17308249001184768
182693524485431382
1923575195919671458
20206647076624751357

[1,5,35,265,2100,17075,141246,1182719,9994086,
 85049639,727865758,6257933219,54010196582,
 467657712902,4060558796894,35341693437365,
 308249001184768,2693524485431382,
 23575195919671458,206647076624751357]