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A254931 as a simple table

na(n)
13
24
37
45
58
611
77
812
915
1010
118
1213
1316
149
1514
1617
1723
1813
1918
2011
2127
2214
2319
2412
2522
2617
2725
2828
2923
3018
3114
3232
3335
3419
3517
3622
3730
3825
3936
4039
4116
4228
4323
4431
4521
4619
4740
4820
4918
5038

[3,4,7,5,8,11,7,12,15,10,8,13,16,9,14,17,23,13,18,
 11,27,14,19,12,22,17,25,28,23,18,14,32,35,19,17,
 22,30,25,36,39,16,28,23,31,21,19,40,20,18,38]