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A015530 as a simple table

na(n)
00
11
24
319
488
5409
61900
78827
841008
9190513
10885076
114111843
1219102600
1388745929
14412291516
151915403851
168898489952
1741340171361
18192056155300
19892245135283
204145149007032
2119257331433977
2289464772757004

[0,1,4,19,88,409,1900,8827,41008,190513,885076,
 4111843,19102600,88745929,412291516,1915403851,
 8898489952,41340171361,192056155300,892245135283,
 4145149007032,19257331433977,89464772757004]