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Search: id:A027932
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| 1, 3, 8, 21, 55, 143, 364, 894, 2098, 4685, 9955, 20175, 39130, 72905, 130965, 227612, 383911, 630191, 1009242, 1580345, 2424289, 3649547, 5399802, 7863034, 11282400, 15969161, 22317933, 30824563, 42106956, 56929205
(list; graph; listen)
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OFFSET
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5,2
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FORMULA
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a(n)=sum(binomial(n-k, 9-2k), k=0..4). - Len Smiley (smiley(AT)math.uaa.alaska.edu), Oct 20 2001
a(n)=C(n,n-1)+C(n+1,n-2)+C(n+2,n-3)+C(n+3,n-4)+C(n+4,n-5), n>=1 . - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 29 2007
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MAPLE
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seq(binomial(n, n-1)+binomial(n+1, n-2)+binomial(n+2, n-3)+binomial(n+3, n-4)+binomial(n+4, n-5), n=1..30); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 29 2007
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CROSSREFS
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Sequence in context: A077849 A135473 A005580 this_sequence A084625 A001906 A088305
Adjacent sequences: A027929 A027930 A027931 this_sequence A027933 A027934 A027935
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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