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A051912 as a simple table

na(n)
00
11
24
313
432
571
6124
7218
8375
9572
10744
111208
121556
132441
143097
154047
165297
176703
187838
1910986
2012331
2115464
2219143
2324545
2428973
2534405
2637768
2745863
2850876
2961371
3068302
3177917
3288544
33101916
34122031
35131624
36148574
37171236
38197814

[0,1,4,13,32,71,124,218,375,572,744,1208,1556,
 2441,3097,4047,5297,6703,7838,10986,12331,15464,
 19143,24545,28973,34405,37768,45863,50876,61371,
 68302,77917,88544,101916,122031,131624,148574,
 171236,197814]