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A252814 as a simple table

na(n)
12
26
317
440
581
6147
7246
8387
9580
10836
111167
121586
132107
142745
153516
164437
175526
186802
198285
209996
2111957
2214191
2316722
2419575
2522776
2626352
2730331
2834742
2939615
3044981
3150872
3257321
3364362
3472030
3580361
3689392
3799161
38109707
39121070
40133291

[2,6,17,40,81,147,246,387,580,836,1167,1586,2107,
 2745,3516,4437,5526,6802,8285,9996,11957,14191,
 16722,19575,22776,26352,30331,34742,39615,44981,
 50872,57321,64362,72030,80361,89392,99161,109707,
 121070,133291]