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Search: id:A014533
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| A014533 |
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Form array in which n-th row is obtained by expanding (1+x+x^2)^n and taking the 4th column from the center. |
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+0
5
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| 1, 5, 21, 77, 266, 882, 2850, 9042, 28314, 87802, 270270, 827190, 2520336, 7651632, 23162976, 69954048, 210859245, 634569201, 1907165337, 5725520801, 17172595110, 51465297950, 154135675070, 461366154990, 1380317174145
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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First differences seem to be in A025182.
a(n-3) = A111808(n,n-4) for n>3. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 17 2005
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REFERENCES
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L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 78.
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LINKS
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Eric Weisstein's World of Mathematics, Trinomial Coefficient
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CROSSREFS
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Sequence in context: A079923 A126645 A026329 this_sequence A134770 A084780 A055219
Adjacent sequences: A014530 A014531 A014532 this_sequence A014534 A014535 A014536
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), Feb 05 2000
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