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A154029 as a simple table

na(n)
00
11
23
33
48
515
615
7105
824
9945
1035
1110395
1248
13135135
1463
152027025
1680
1734459425
1899
19654729075
20120
2113749310575
22143
23316234143225
24168
257905853580625
26195
27213458046676875
28224
296190283353629375
30255
31191898783962510625
32288

[0,1,3,3,8,15,15,105,24,945,35,10395,48,135135,63,
 2027025,80,34459425,99,654729075,120,13749310575,
 143,316234143225,168,7905853580625,195,
 213458046676875,224,6190283353629375,255,
 191898783962510625,288]