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A055403 as a simple table

na(n)
01
15
220
370
4165
5357
6688
71154
81867
92907
104272
116070
128357
1311307
1414998
1519470
1624809
1731211
1838928
1947816
2058201
2170361
2283962
2399648
24117519
25137521
26160270
27185528
28213615
29244649
30279370
31317006
32358809
33404823
34454838
35509486
36568493

[1,5,20,70,165,357,688,1154,1867,2907,4272,6070,
 8357,11307,14998,19470,24809,31211,38928,47816,
 58201,70361,83962,99648,117519,137521,160270,
 185528,213615,244649,279370,317006,358809,404823,
 454838,509486,568493]