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A206806 as a simple table

na(n)
21
34
413
530
662
7112
8190
9300
10455
11660
12931
131274
141708
152240
162892
173672
184605
195700
206985
218470
2210186
2312144
2414378
2516900
2619747
2722932
2826495
2930450
3034840
3139680
3245016
3350864
3457273
3564260
3671877
3780142
3889110
3998800
40109270
41120540
42132671
43145684

[1,4,13,30,62,112,190,300,455,660,931,1274,1708,
 2240,2892,3672,4605,5700,6985,8470,10186,12144,
 14378,16900,19747,22932,26495,30450,34840,39680,
 45016,50864,57273,64260,71877,80142,89110,98800,
 109270,120540,132671,145684]