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A253558 as a simple table

na(n)
11
21
32
41
53
62
74
81
92
103
115
122
136
144
153
161
177
182
198
203
212
225
239
242
253
266
274
284
2910
303
3111
321
333
347
354
362
3712
388
395
403
4113
422
4314
445
452
469
4715
482
494
503
513
526
5316
544
553
564
574
5810
5917
603
6118
6211
636
641
655
663
6719
687
693
704
7120
722
7321
7412
757
768
775
785
7922
803
815
8213
8323
842
854
8614
874
885
8924
902
914
929
932
9415
956
962
9725
984
998
1003
10126
1023

[1,1,2,1,3,2,4,1,2,3,5,2,6,4,3,1,7,2,8,3,2,5,9,2,
 3,6,4,4,10,3,11,1,3,7,4,2,12,8,5,3,13,2,14,5,2,9,
 15,2,4,3,3,6,16,4,3,4,4,10,17,3,18,11,6,1,5,3,19,
 7,3,4,20,2,21,12,7,8,5,5,22,3,5,13,23,2,4,14,4,5,
 24,2,4,9,2,15,6,2,25,4,8,3,26,3]