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Search: id:A027555
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| A027555 |
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Triangle of binomial coefficients C(-n,k). |
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+0
15
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| 1, 1, -1, 1, -2, 3, 1, -3, 6, -10, 1, -4, 10, -20, 35, 1, -5, 15, -35, 70, -126, 1, -6, 21, -56, 126, -252, 462, 1, -7, 28, -84, 210, -462, 924, -1716, 1, -8, 36, -120, 330, -792, 1716, -3432, 6435, 1, -9, 45, -165, 495, -1287, 3003, -6435, 12870, -24310, 1, -10, 55, -220, 715, -2002, 5005
(list; table; graph; listen)
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OFFSET
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0,5
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REFERENCES
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R. L. Graham, D. E. Knuth and O. Patashnik, Concrete Mathematics. Addison-Wesley, Reading, MA, 1990, p. 164.
J. Riordan, Combinatorial Identities, Wiley, 1968, p. 2.
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LINKS
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T. D. Noe, Rows n=0..50 of triangle, flattened
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CROSSREFS
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For the unsigned triangle see A059481.
Sequence in context: A101912 A111808 A081422 this_sequence A059481 A113592 A136555
Adjacent sequences: A027552 A027553 A027554 this_sequence A027556 A027557 A027558
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KEYWORD
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sign,tabl,nice,easy
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AUTHOR
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njas, Olivier Gerard (ogerard(AT)ext.jussieu.fr)
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