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A273900 as a simple table

na(n)
21
32
45
514
640
7116
8341
91014
103045
119222
1228137
1386408
14266887
15828560
162584111
178092646
1825438494
1980235386
20253854855
21805447478
222562252423
238170557076
2426112495767
2583626191936
26268331079046
27862537758650
282777237155053
298956318767652
3028925845302365

[1,2,5,14,40,116,341,1014,3045,9222,28137,86408,
 266887,828560,2584111,8092646,25438494,80235386,
 253854855,805447478,2562252423,8170557076,
 26112495767,83626191936,268331079046,862537758650,
 2777237155053,8956318767652,28925845302365]