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A085939 as a simple table

na(n)
00
11
24
322
4112
5580
62992
715448
879744
9411664
102125120
1110970464
1256632576
13292353088
141509207808
157790949760
1640219045888
17207621882112
181071801803776
195532938507776
2028562564853760

[0,1,4,22,112,580,2992,15448,79744,411664,2125120,
 10970464,56632576,292353088,1509207808,7790949760,
 40219045888,207621882112,1071801803776,
 5532938507776,28562564853760]