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A257686 as a simple table

na(n)
00
11
22
32
44
54
66
76
86
96
106
116
1212
1312
1412
1512
1612
1712
1818
1918
2018
2118
2218
2318
2424
2524
2624
2724
2824
2924
3024
3124
3224
3324
3424
3524
3624
3724
3824
3924
4024
4124
4224
4324
4424
4524
4624
4724
4848
4948
5048
5148
5248
5348
5448
5548
5648
5748
5848
5948
6048
6148
6248
6348
6448
6548
6648
6748
6848
6948
7048
7148
7272

[0,1,2,2,4,4,6,6,6,6,6,6,12,12,12,12,12,12,18,18,
 18,18,18,18,24,24,24,24,24,24,24,24,24,24,24,24,
 24,24,24,24,24,24,24,24,24,24,24,24,48,48,48,48,
 48,48,48,48,48,48,48,48,48,48,48,48,48,48,48,48,
 48,48,48,48,72]