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A004649 as a simple table

na(n)
20
31
41
53
63
75
85
97
102
111
124
135
144
155
168
1711
1810
1913
2014
2113
2216
2317
2420
251
261
2725
2826
2925
3026
317
327
339
347
3513
3611
3713
3815
3915
4017
4119
4217
4323
4421
4521
4619
4727
4835
4935
5033
5133
5235
5333
5439
5541
5643
5745
5843
5945
6045
6143
6249
6359
6459
6557
6657
671
682
697
704
713
724
737
748

[0,1,1,3,3,5,5,7,2,1,4,5,4,5,8,11,10,13,14,13,16,
 17,20,1,1,25,26,25,26,7,7,9,7,13,11,13,15,15,17,
 19,17,23,21,21,19,27,35,35,33,33,35,33,39,41,43,
 45,43,45,45,43,49,59,59,57,57,1,2,7,4,3,4,7,8]