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A291270 as a simple table

na(n)
20
31
40
52
62
72
82
93
104
114
124
134
144
156
164
176
186
196
208
217
228
238
248
2510
268
279
288
2910
3012
3110
3210
3312
3412
3514
3612
3712
3812
3913
4016
4114
4214
4314
4416
4518
4616
4716
4816
4916
5020
5118
5216
5318
5418
5522
5618
5719
5820
5920
6024
6120
6220
6321
6420
6526
6624
6722
6824
6924
7028

[0,1,0,2,2,2,2,3,4,4,4,4,4,6,4,6,6,6,8,7,8,8,8,10,
 8,9,8,10,12,10,10,12,12,14,12,12,12,13,16,14,14,
 14,16,18,16,16,16,16,20,18,16,18,18,22,18,19,20,
 20,24,20,20,21,20,26,24,22,24,24,28]