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A139251 as a simple table

na(n)
00
11
22
34
44
54
68
712
88
94
108
1112
1212
1316
1428
1532
1616
174
188
1912
2012
2116
2228
2332
2420
2516
2628
2736
2840
2960
3088
3180
3232
334
348
3512
3612
3716
3828
3932
4020
4116
4228
4336
4440
4560
4688
4780
4836
4916
5028
5136
5240
5360
5488
5584
5656
5760
5892
59112
60140
61208
62256
63192
6464
654
668
6712
6812
6916
7028
7132
7220
7316
7428

[0,1,2,4,4,4,8,12,8,4,8,12,12,16,28,32,16,4,8,12,
 12,16,28,32,20,16,28,36,40,60,88,80,32,4,8,12,12,
 16,28,32,20,16,28,36,40,60,88,80,36,16,28,36,40,
 60,88,84,56,60,92,112,140,208,256,192,64,4,8,12,
 12,16,28,32,20,16,28]