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A045999 as a simple table

na(n)
01
12
22
34
46
56
66
78
810
910
1010
1110
1210
1312
1414
1514
1614
1716
1818
1918
2018
2120
2222
2322
2422
2522
2622
2722
2822
2924
3026
3126
3226
3328
3430
3530
3630
3732
3834
3934
4034
4136
4238
4338
4438
4540
4642
4742
4842
4944
5046
5146
5246
5346
5446
5546
5646
5746
5846
5946
6046
6148
6250
6350
6450
6552
6654
6754
6854
6956
7058
7158

[1,2,2,4,6,6,6,8,10,10,10,10,10,12,14,14,14,16,18,
 18,18,20,22,22,22,22,22,22,22,24,26,26,26,28,30,
 30,30,32,34,34,34,36,38,38,38,40,42,42,42,44,46,
 46,46,46,46,46,46,46,46,46,46,48,50,50,50,52,54,
 54,54,56,58,58]