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A180241 as a simple table

na(n)
15
27
38
49
512
617
718
819
921
1022
1123
1224
1325
1428
1531
1632
1733
1835
1937
2038
2139
2241
2342
2444
2545
2646
2747
2851
2952
3053
3154
3255
3357
3459
3560
3661
3763
3865
3966
4067
4168
4269
4370
4471
4572
4673
4774
4875
4977
5078
5179
5280
5381
5482
5583
5684
5785
5887
5988
6089
6190
6291
6393
6495
6596
6697
6798
6899
69100
70101

[5,7,8,9,12,17,18,19,21,22,23,24,25,28,31,32,33,
 35,37,38,39,41,42,44,45,46,47,51,52,53,54,55,57,
 59,60,61,63,65,66,67,68,69,70,71,72,73,74,75,77,
 78,79,80,81,82,83,84,85,87,88,89,90,91,93,95,96,
 97,98,99,100,101]