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A203292 as a simple table

na(n)
13
26
312
421
535
654
780
8113
9155
10206
11268
12341
13427
14526
15640
16769
17915
181078
191260
201461
211683
221926
232192
242481
252795
263134
273500
283893
294315
304766
315248
325761
336307
346886
357500
368149
378835
389558
3910320
4011121
4111963
4212846
4313772
4414741
4515755

[3,6,12,21,35,54,80,113,155,206,268,341,427,526,
 640,769,915,1078,1260,1461,1683,1926,2192,2481,
 2795,3134,3500,3893,4315,4766,5248,5761,6307,6886,
 7500,8149,8835,9558,10320,11121,11963,12846,13772,
 14741,15755]