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A331381 as a simple table

na(n)
01
11
21
31
41
53
61
75
82
96
106
115
125
137
144
157
167
177
1810
198
209
216
2210
239
249
2515
267
2712
2810
2914
3010
3110
328
338
3415
3510
367
3716
3813
399
4010
4114
4212
4310
448
4514
4611
4713
4811
4916
5015
5114
5215
5315
5410
5514
5618
5711
5812
5913
6013
6118
6221
6315
6416
6519
6616
6715
688
6917
7017

[1,1,1,1,1,3,1,5,2,6,6,5,5,7,4,7,7,7,10,8,9,6,10,
 9,9,15,7,12,10,14,10,10,8,8,15,10,7,16,13,9,10,14,
 12,10,8,14,11,13,11,16,15,14,15,15,10,14,18,11,12,
 13,13,18,21,15,16,19,16,15,8,17,17]