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A124479 as a simple table

na(n)
20
31
411
537
688
7175
8311
9511
10792
111173
121675
132321
143136
154147
165383
176875
188656
1910761
2013227
2116093
2219400
2323191
2427511
2532407
2637928
2744125
2851051
2958761
3067312
3176763
3287175
3398611
34111136
35124817
36139723
37155925
38173496
39192511
40213047
41235183
42259000

[0,1,11,37,88,175,311,511,792,1173,1675,2321,3136,
 4147,5383,6875,8656,10761,13227,16093,19400,23191,
 27511,32407,37928,44125,51051,58761,67312,76763,
 87175,98611,111136,124817,139723,155925,173496,
 192511,213047,235183,259000]