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A309681 as a simple table

na(n)
12
24
35
46
52
66
74
813
95
106
112
126
1313
149
155
1618
172
1818
199
204
2119
2213
239
2417
256
2620
2718
2826
2930
3017
3113
3235
335
3419
352
3619
3735
3823
394
409
4147
4223
4317
4420
456
4630
4750
484
4960
5020
5150
525
5318
542
5518
5650
5741
5826
5923
6035
617
6242
6317
6447
6521
6613
6735
6837
6960
705
7119
722
7319
7460
756

[2,4,5,6,2,6,4,13,5,6,2,6,13,9,5,18,2,18,9,4,19,
 13,9,17,6,20,18,26,30,17,13,35,5,19,2,19,35,23,4,
 9,47,23,17,20,6,30,50,4,60,20,50,5,18,2,18,50,41,
 26,23,35,7,42,17,47,21,13,35,37,60,5,19,2,19,60,6]