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A374713 as a simple table

na(n)
11
24
310
420
535
655
783
8119
9164
10218
11280
12343
13431
14535
15648
16760
17903
181064
191241
201442
211659
221891
232151
242409
252714
263044
273369
283754
294160
304582
315044
325499
336015
346500
357094
367669
378308
388990
399683
4010394
4111180
4212010
4312876
4413773
4514720
4615693
4716721
4817705
4918845
5020010

[1,4,10,20,35,55,83,119,164,218,280,343,431,535,
 648,760,903,1064,1241,1442,1659,1891,2151,2409,
 2714,3044,3369,3754,4160,4582,5044,5499,6015,6500,
 7094,7669,8308,8990,9683,10394,11180,12010,12876,
 13773,14720,15693,16721,17705,18845,20010]