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A130481 as a simple table

na(n)
00
11
23
33
44
56
66
77
89
99
1010
1112
1212
1313
1415
1515
1616
1718
1818
1919
2021
2121
2222
2324
2424
2525
2627
2727
2828
2930
3030
3131
3233
3333
3434
3536
3636
3737
3839
3939
4040
4142
4242
4343
4445
4545
4646
4748
4848
4949
5051
5151
5252
5354
5454
5555
5657
5757
5858
5960
6060
6161
6263
6363
6464
6566
6666
6767
6869
6969
7070
7172
7272

[0,1,3,3,4,6,6,7,9,9,10,12,12,13,15,15,16,18,18,
 19,21,21,22,24,24,25,27,27,28,30,30,31,33,33,34,
 36,36,37,39,39,40,42,42,43,45,45,46,48,48,49,51,
 51,52,54,54,55,57,57,58,60,60,61,63,63,64,66,66,
 67,69,69,70,72,72]