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1, 3, 2, 4, 7, 6, 8, 5, 9, 13, 12, 14, 11, 15, 10, 16, 21, 20, 22, 19, 23, 18, 24, 17, 25, 31, 30, 32, 29, 33, 28, 34, 27, 35, 26, 36, 43, 42, 44, 41, 45, 40, 46, 39, 47, 38, 48, 37, 49, 57, 56, 58, 55, 59, 54, 60, 53, 61, 52, 62, 51, 63, 50, 64, 73, 72, 74, 71, 75, 70, 76, 69, 77, 68, 78
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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The even central polygonal numbers divided by 2 give the central column of the triangle. - Omar E. Pol, Aug 16 2011
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REFERENCES
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J. H. Conway, Personal communication, Feb 19 2010
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LINKS
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EXAMPLE
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1
3 2 4
7 6 8 5 9
13 12 14 11 15 10 16
21 20 22 19 23 18 24 17 25
31 30 32 29 33 28 34 27 35 26 36
43 42 44 41 45 40 46 39 47 38 48 37 49
57 56 58 55 59 54 60 53 61 52 62 51 63 50 64
73 72 74 71 75 70 76 69 77 68 78 67 79 66 80 65 81
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CROSSREFS
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KEYWORD
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nonn,tabf
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AUTHOR
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STATUS
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approved
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