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A097281 as a simple table

na(n)
00
11
22
35
49
518
635
771
8144
9294
10601
111231
122526
135191
1410672
1521950
1645159
1792920
18191214
19393512
20809864
211666775
223430425
237060297
2414531166
2529907455
2661554442
27126689294
28260747884
29536663296
301104544280
312273340315

[0,1,2,5,9,18,35,71,144,294,601,1231,2526,5191,
 10672,21950,45159,92920,191214,393512,809864,
 1666775,3430425,7060297,14531166,29907455,
 61554442,126689294,260747884,536663296,1104544280,
 2273340315]