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A289579 as a simple table

na(n)
01
12
25
313
426
557
6119
7244
8490
91001
102007
114052
128106
1316281
1432615
1565372
16130722
17261793
18523615
191047900
202095778
214192957
228385867
2316774436
2433549018
2567103397
26134206803
27268424396
28536849202
291073716417
302147443519
314294925504
328589845432

[1,2,5,13,26,57,119,244,490,1001,2007,4052,8106,
 16281,32615,65372,130722,261793,523615,1047900,
 2095778,4192957,8385867,16774436,33549018,
 67103397,134206803,268424396,536849202,1073716417,
 2147443519,4294925504,8589845432]