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A004488 as a simple table

na(n)
00
12
21
36
48
57
63
75
84
918
1020
1119
1224
1326
1425
1521
1623
1722
189
1911
2010
2115
2217
2316
2412
2514
2613
2754
2856
2955
3060
3162
3261
3357
3459
3558
3672
3774
3873
3978
4080
4179
4275
4377
4476
4563
4665
4764
4869
4971
5070
5166
5268
5367
5427
5529
5628
5733
5835
5934
6030
6132
6231
6345
6447
6546
6651

[0,2,1,6,8,7,3,5,4,18,20,19,24,26,25,21,23,22,9,
 11,10,15,17,16,12,14,13,54,56,55,60,62,61,57,59,
 58,72,74,73,78,80,79,75,77,76,63,65,64,69,71,70,
 66,68,67,27,29,28,33,35,34,30,32,31,45,47,46,51]