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A161986 as a simple table

na(n)
14
27
38
49
511
613
715
817
916
1019
1121
1222
1323
1425
1525
1627
1727
1829
1931
2032
2135
2235
2337
2437
2539
2640
2741
2843
2945
3047
3147
3249
3349
3451
3553
3653
3755
3856
3957
4058
4159
4261
4363
4464
4564
4668
4767
4869
4971
5071
5173
5275
5377
5477
5581
5679
5781
5881
5983
6085
6187
6287
6389
6489
6591
6697
6793
6894
6995
7099
7197

[4,7,8,9,11,13,15,17,16,19,21,22,23,25,25,27,27,
 29,31,32,35,35,37,37,39,40,41,43,45,47,47,49,49,
 51,53,53,55,56,57,58,59,61,63,64,64,68,67,69,71,
 71,73,75,77,77,81,79,81,81,83,85,87,87,89,89,91,
 97,93,94,95,99,97]