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A004272 as a simple table

na(n)
00
11
22
33
44
55
66
78
810
912
1014
1116
1218
1320
1422
1524
1626
1728
1830
1932
2034
2136
2238
2340
2442
2544
2646
2748
2850
2952
3054
3156
3258
3360
3462
3564
3666
3768
3870
3972
4074
4176
4278
4380
4482
4584
4686
4788
4890
4992
5094
5196
5298
53100
54102
55104

[0,1,2,3,4,5,6,8,10,12,14,16,18,20,22,24,26,28,30,
 32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,
 64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,
 96,98,100,102,104]