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A154926
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Signed version of Pascal's triangle. Diagonal positive, rest negative.
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1
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1, -1, 1, -1, -2, 1, -1, -3, -3, 1, -1, -4, -6, -4, 1, -1, -5, -10, -10, -5, 1, -1, -6, -15, -20, -15, -6, 1, -1, -7, -21, -35, -35, -21, -7, 1, -1, -8, -28, -56, -70, -56, -28, -8, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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COMMENTS
| Matrix inverse of this lower triangular array is A154921. Signs in columns as in sequence A153881.
Exponential Riordan array [2-exp(x),x]. [Paul Barry, April 6 2011]
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EXAMPLE
| Contribution from Mats Granvik (mats.granvik(AT)abo.fi), Jul 24 2009: (Start)
Table begins:
.1
-1....1
-1...-2....1
-1...-3...-3....1
-1...-4...-6...-4....1
-1...-5..-10..-10...-5....1
-1...-6..-15..-20..-15...-6....1
-1...-7..-21..-35..-35..-21...-7....1
-1...-8..-28..-56..-70..-56..-28...-8....1
-1...-9..-36..-84.-126.-126..-84..-36...-9....1
-1..-10..-45.-120.-210.-252.-210.-120..-45..-10....1
-1..-11..-55.-165.-330.-462.-462.-330.-165..-55..-11....1
(End)
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CROSSREFS
| Cf. A007318, A153881.
Sequence in context: A034932 A180183 A094495 * A117440 A118433 A007318
Adjacent sequences: A154923 A154924 A154925 * A154927 A154928 A154929
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KEYWORD
| sign,tabl
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AUTHOR
| Mats Granvik (mats.granvik(AT)abo.fi), Jan 17 2009
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