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A287673 as a simple table

na(n)
01
11
22
35
415
552
6203
7877
84140
921147
10115975
11678570
124213597
1327644436
14190898290
151382887161
1610477990158
1782819430415
18681282289857
195820296183791
2051541816775857
21472306124149579
224471549108520595
2343676154621078016
24439558508006341652

[1,1,2,5,15,52,203,877,4140,21147,115975,678570,
 4213597,27644436,190898290,1382887161,10477990158,
 82819430415,681282289857,5820296183791,
 51541816775857,472306124149579,4471549108520595,
 43676154621078016,439558508006341652]