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A004396 as a simple table

na(n)
00
11
21
32
43
53
64
75
85
96
107
117
128
139
149
1510
1611
1711
1812
1913
2013
2114
2215
2315
2416
2517
2617
2718
2819
2919
3020
3121
3221
3322
3423
3523
3624
3725
3825
3926
4027
4127
4228
4329
4429
4530
4631
4731
4832
4933
5033
5134
5235
5335
5436
5537
5637
5738
5839
5939
6040
6141
6241
6342
6443
6543
6644
6745
6845
6946
7047
7147

[0,1,1,2,3,3,4,5,5,6,7,7,8,9,9,10,11,11,12,13,13,
 14,15,15,16,17,17,18,19,19,20,21,21,22,23,23,24,
 25,25,26,27,27,28,29,29,30,31,31,32,33,33,34,35,
 35,36,37,37,38,39,39,40,41,41,42,43,43,44,45,45,
 46,47,47]