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A109681 as a simple table

na(n)
00
11
25
33
44
58
66
716
811
99
1010
1114
1212
1313
1417
1515
1625
1720
1818
1919
2023
2121
2222
2326
2451
2534
2629
2727
2828
2932
3030
3131
3235
3333
3443
3538
3636
3737
3841
3939
4040
4144
4242
4352
4447
4545
4646
4750
4848
4949
5053
5178
5261
5356
5454
5555
5659
5757
5858
5962
6060
6170
6265
6363
6464
6568
6666

[0,1,5,3,4,8,6,16,11,9,10,14,12,13,17,15,25,20,18,
 19,23,21,22,26,51,34,29,27,28,32,30,31,35,33,43,
 38,36,37,41,39,40,44,42,52,47,45,46,50,48,49,53,
 78,61,56,54,55,59,57,58,62,60,70,65,63,64,68,66]