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A025544 as a simple table

na(n)
12
23
34
45
56
66
77
87
98
108
118
128
139
149
1510
1611
1712
1812
1912
2013
2113
2214
2314
2414
2515
2615
2715
2815
2915
3015
3116
3216
3317
3417
3517
3617
3717
3817
3917
4017
4118
4218
4319
4419
4520
4620
4720
4820
4920
5020
5120
5221
5321
5421
5521
5621
5721
5822
5923
6023
6123
6224
6324
6424
6524
6624
6724
6824
6925
7025
7125
7225
7325
7425

[2,3,4,5,6,6,7,7,8,8,8,8,9,9,10,11,12,12,12,13,13,
 14,14,14,15,15,15,15,15,15,16,16,17,17,17,17,17,
 17,17,17,18,18,19,19,20,20,20,20,20,20,20,21,21,
 21,21,21,21,22,23,23,23,24,24,24,24,24,24,24,25,
 25,25,25,25,25]