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A308431 as a simple table

na(n)
00
12
21
36
45
59
68
711
810
910
109
1112
1211
1314
1413
1511
1610
1715
1814
1912
2011
2114
2213
2318
2417
2515
2614
2719
2818
2921
3020
3110
329
3322
3421
3511
3610
3713
3812
3917
4016
4114
4213
4318
4417
4520
4619
4715
4814
4921
5020
5116
5215
5318
5417
5521
5620
5719
5818
5922
6021
6124
6223
6314
6413
6525
6624

[0,2,1,6,5,9,8,11,10,10,9,12,11,14,13,11,10,15,14,
 12,11,14,13,18,17,15,14,19,18,21,20,10,9,22,21,11,
 10,13,12,17,16,14,13,18,17,20,19,15,14,21,20,16,
 15,18,17,21,20,19,18,22,21,24,23,14,13,25,24]