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A049747 as a simple table

na(n)
00
12
22
33
43
53
65
75
85
95
109
117
125
137
149
1513
1611
179
189
1911
2013
2119
2215
2311
2411
2511
2615
2719
2823
2921
3017
3113
3213
3317
3421
3523
3631
3725
3821
3919
4017
4119
4221
4325
4431
4539
4635
4727
4823
4923
5023
5123
5227
5335
5439
5549
5641
5735
5829
5925
6025
6125
6229
6335
6441
6549

[0,2,2,3,3,3,5,5,5,5,9,7,5,7,9,13,11,9,9,11,13,19,
 15,11,11,11,15,19,23,21,17,13,13,17,21,23,31,25,
 21,19,17,19,21,25,31,39,35,27,23,23,23,23,27,35,
 39,49,41,35,29,25,25,25,29,35,41,49]