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A291249 as a simple table

na(n)
01
12
25
310
423
547
6102
7214
8452
9955
102003
114223
128854
1318610
1439032
1581896
16171752
17360103
18754985
191582497
203316978
216951684
2214568692
2330530311
2463977107
25134063288
26280920507
27588643384
281233430247
292584481968
305415381139
3111347029572
3223775710791

[1,2,5,10,23,47,102,214,452,955,2003,4223,8854,
 18610,39032,81896,171752,360103,754985,1582497,
 3316978,6951684,14568692,30530311,63977107,
 134063288,280920507,588643384,1233430247,
 2584481968,5415381139,11347029572,23775710791]