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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A097288 Rectangular array read by antidiagonals obtained from A097287 by deleting the zeros.

Original entry on oeis.org

2, 1, 6, 3, 4, 12, 7, 5, 8, 20, 13, 9, 10, 14, 30, 21, 15, 11, 16, 22, 42, 31, 23, 17, 18, 24, 32, 56, 43, 33, 25, 19, 26, 34, 44, 72, 57, 45, 35, 27, 28, 36, 46, 58, 90, 73, 59, 47, 37, 29, 38, 48, 60, 74, 110, 91, 75, 61, 49, 39, 40, 50, 62, 76, 92, 132, 111, 93, 77, 63, 51
Offset: 1

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Author

Clark Kimberling, Aug 05 2004

Keywords

Comments

As a sequence, this is a permutation of the natural numbers. Evens lie on or below the main diagonal; odds, above. The triangle formed by the evens is twice that of A066182.

Examples

			Northwest corner:
2 1 3 7 13
6 4 5 9 15
12 8 10 11 17
20 14 16 18 19

Crossrefs

Cf. A097287.
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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