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A074033 as a simple table

na(n)
11
20
31
44
515
640
7144
8512
91841
106528
1123808
1287380
13322875
141198080
154473647
1616777216
1763164175
18238605640
19904200192
203435973836
2113089461538
2249977753600
23191219367936
24733007751680
252814750270420
2610825959997440
2741699995927744
28160842843834660

[1,0,1,4,15,40,144,512,1841,6528,23808,87380,
 322875,1198080,4473647,16777216,63164175,
 238605640,904200192,3435973836,13089461538,
 49977753600,191219367936,733007751680,
 2814750270420,10825959997440,41699995927744,
 160842843834660]