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A097720 as a simple table

na(n)
15
211
35
411
517
619
718
819
916
1012
1113
1217
1316
1415
1515
1616
1713
1815
1915
2014
2116
2215
2316
2410
2515
2626
2719
2818
2927
3020
3120
3224
3321
3417
3518
3618
3719
3818
3923
4020
4120
4217
4320
4421
4525
4620
4720
4818
4917
5019
5116
5219
5316
5415
5517
5618
5716
5820
5917
6016
6122
6218
6318
6419
6514
6620
6716
6819
6920
7014

[5,11,5,11,17,19,18,19,16,12,13,17,16,15,15,16,13,
 15,15,14,16,15,16,10,15,26,19,18,27,20,20,24,21,
 17,18,18,19,18,23,20,20,17,20,21,25,20,20,18,17,
 19,16,19,16,15,17,18,16,20,17,16,22,18,18,19,14,
 20,16,19,20,14]