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A001561 as a simple table

na(n)
090
11560
26460
316848
434782
562320
6101520
7154440
8223138
9309672
10416100
11544480
12696870
13875328
141081912
151318680
161587690
171891000
182230668
192608752
203027310
213488400
223994080
234546408
245147442
255799240
266503860
277263360
288079798
298955232
309891720

[90,1560,6460,16848,34782,62320,101520,154440,
 223138,309672,416100,544480,696870,875328,1081912,
 1318680,1587690,1891000,2230668,2608752,3027310,
 3488400,3994080,4546408,5147442,5799240,6503860,
 7263360,8079798,8955232,9891720]