login

A251726 as a simple table

na(n)
12
23
34
45
56
67
78
89
911
1012
1113
1215
1316
1417
1518
1619
1721
1823
1924
2025
2127
2229
2331
2432
2535
2636
2737
2841
2943
3045
3147
3248
3349
3453
3554
3655
3759
3861
3963
4064
4165
4267
4371
4472
4573
4675
4777
4879
4981
5083
5185
5289
5391
5495
5596
5697
57101
58103
59105
60107
61108
62109
63113
64115
65119
66121
67125
68127
69128
70131
71133
72135
73137
74139
75143
76144

[2,3,4,5,6,7,8,9,11,12,13,15,16,17,18,19,21,23,24,
 25,27,29,31,32,35,36,37,41,43,45,47,48,49,53,54,
 55,59,61,63,64,65,67,71,72,73,75,77,79,81,83,85,
 89,91,95,96,97,101,103,105,107,108,109,113,115,
 119,121,125,127,128,131,133,135,137,139,143,144]