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A007843 as a simple table

na(n)
01
12
24
34
46
58
68
78
810
912
1012
1114
1216
1316
1416
1516
1618
1720
1820
1922
2024
2124
2224
2326
2428
2528
2630
2732
2832
2932
3032
3132
3234
3336
3436
3538
3640
3740
3840
3942
4044
4144
4246
4348
4448
4548
4648
4750
4852
4952
5054
5156
5256
5356
5458
5560
5660
5762
5864
5964
6064
6164
6264
6364
6466
6568
6668
6770
6872
6972
7072
7174
7276
7376
7478

[1,2,4,4,6,8,8,8,10,12,12,14,16,16,16,16,18,20,20,
 22,24,24,24,26,28,28,30,32,32,32,32,32,34,36,36,
 38,40,40,40,42,44,44,46,48,48,48,48,50,52,52,54,
 56,56,56,58,60,60,62,64,64,64,64,64,64,66,68,68,
 70,72,72,72,74,76,76,78]