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A288811 as a simple table

na(n)
01
12
25
312
427
557
6117
7240
8495
9999
102007
114035
128123
1316281
1432597
1565280
16130815
17261759
18523647
191047615
202096063
214192671
228385887
2316773135
2433550319
2567102695
26134207447
27268420035
28536853435
291073715609
302147439957
314294901760
328589869055

[1,2,5,12,27,57,117,240,495,999,2007,4035,8123,
 16281,32597,65280,130815,261759,523647,1047615,
 2096063,4192671,8385887,16773135,33550319,
 67102695,134207447,268420035,536853435,1073715609,
 2147439957,4294901760,8589869055]