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A056011
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Unique triangle such that (1) every positive integer occurs exactly once; (2) row n consists of n consecutive numbers; (3) odd-numbered rows are increasing; and (4) even-numbered rows are decreasing.
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1
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1, 3, 2, 4, 5, 6, 10, 9, 8, 7, 11, 12, 13, 14, 15, 21, 20, 19, 18, 17, 16, 22, 23, 24, 25, 26, 27, 28, 36, 35, 34, 33, 32, 31, 30, 29, 37, 38, 39, 40, 41, 42, 43, 44, 45, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Self-inverse permutation of the natural numbers.
Mirror image of triangle in A056023 . [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Apr 04 2009]
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LINKS
| Index entries for sequences that are permutations of the natural numbers
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EXAMPLE
| 1; 3,2; 4,5,6; 10,9,8,7; 11,12,13,14,15; ...
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CROSSREFS
| Sequence in context: A113001 A036812 A039906 * A117123 A116966 A163241
Adjacent sequences: A056008 A056009 A056010 * A056012 A056013 A056014
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KEYWORD
| nonn,tabl,nice
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu), Aug 01 2000
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