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A140408
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Irregular triangle T(n,k) read by rows: n repetitions of -1 followed by (n+1) repetitions of n+1.
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0
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1, -1, 2, 2, -1, -1, 3, 3, 3, -1, -1, -1, 4, 4, 4, 4, -1, -1, -1, -1, 5, 5, 5, 5, 5, -1, -1, -1, -1, -1, 6, 6, 6, 6, 6, 6, -1, -1, -1, -1, -1, -1, 7, 7, 7, 7, 7, 7, 7, -1, -1, -1, -1, -1, -1, -1, 8, 8, 8, 8, 8, 8, 8, 8, -1, -1, -1, -1, -1, -1, -1, -1, 9, 9, 9, 9, 9, 9, 9, 9, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Row n has 2n+1 terms.
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EXAMPLE
| 1,
-1, 2, 2,
-1, -1, 3, 3, 3,
-1, -1, -1, 4, 4, 4, 4,
-1, -1, -1, -1, 5, 5, 5, 5, 5,
-1, -1, -1, -1, -1, 6, 6, 6, 6, 6, 6,
-1, -1, -1, -1, -1, -1, 7, 7, 7, 7, 7, 7, 7,
-1, -1, -1, -1, -1, -1, -1, 8, 8, 8, 8, 8, 8, 8, 8,
-1, -1, -1, -1, -1, -1, -1, -1, 9, 9, 9, 9, 9, 9, 9, 9, 9,
-1, -1, -1, -1, -1, -1, -1, -1, -1, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10
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CROSSREFS
| Cf. A002061 (row sums).
Sequence in context: A102481 A110659 A100522 * A047080 A036064 A090706
Adjacent sequences: A140405 A140406 A140407 * A140409 A140410 A140411
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KEYWORD
| sign,tabf,easy
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Jun 16 2008
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