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A003817 as a simple table

na(n)
00
11
23
33
47
57
67
77
815
915
1015
1115
1215
1315
1415
1515
1631
1731
1831
1931
2031
2131
2231
2331
2431
2531
2631
2731
2831
2931
3031
3131
3263
3363
3463
3563
3663
3763
3863
3963
4063
4163
4263
4363
4463
4563
4663
4763
4863
4963
5063
5163
5263
5363
5463
5563
5663
5763
5863
5963
6063
6163

[0,1,3,3,7,7,7,7,15,15,15,15,15,15,15,15,31,31,31,
 31,31,31,31,31,31,31,31,31,31,31,31,31,63,63,63,
 63,63,63,63,63,63,63,63,63,63,63,63,63,63,63,63,
 63,63,63,63,63,63,63,63,63,63,63]