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A028032 as a simple table

na(n)
01
120
2255
32650
424521
5210840
61725235
713631750
8104995341
9793395460
105908353815
1143502236050
12317443722961
132299938136880
1416567618807995
15118785894675550
16848393691575381
176040178746163100
1842890062369599775
19303884399490790250
202149118961443240601

[1,20,255,2650,24521,210840,1725235,13631750,
 104995341,793395460,5908353815,43502236050,
 317443722961,2299938136880,16567618807995,
 118785894675550,848393691575381,6040178746163100,
 42890062369599775,303884399490790250,
 2149118961443240601]