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A074031 as a simple table

na(n)
11
20
32
40
515
640
7153
8480
91841
106528
1123901
1287040
13322875
141198080
154474738
1616773120
1763164175
18238605640
19904213989
203435921408
2113089461538
2249977753600
23191219550297
24733007052640
252814750270420
2610825959997440
2741699998413248
28160842834247680

[1,0,2,0,15,40,153,480,1841,6528,23901,87040,
 322875,1198080,4474738,16773120,63164175,
 238605640,904213989,3435921408,13089461538,
 49977753600,191219550297,733007052640,
 2814750270420,10825959997440,41699998413248,
 160842834247680]