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A015524 as a simple table

na(n)
00
11
23
316
469
5319
61440
76553
829739
9135088
10613437
112785927
1212651840
1357457009
14260933907
151185000784
165381539701
1724439624591
18110989651680
19504046327177
202289066543291
2110395523920112
2247210037563373

[0,1,3,16,69,319,1440,6553,29739,135088,613437,
 2785927,12651840,57457009,260933907,1185000784,
 5381539701,24439624591,110989651680,504046327177,
 2289066543291,10395523920112,47210037563373]