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Search: id:A027930
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| 1, 3, 8, 21, 54, 133, 309, 674, 1383, 2683, 4950, 8735, 14820, 24285, 38587, 59652, 89981, 132771, 192052, 272841, 381314, 524997, 712977, 956134, 1267395, 1662011, 2157858, 2775763, 3539856, 4477949, 5621943, 7008264
(list; graph; listen)
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OFFSET
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4,2
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FORMULA
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a(n)=sum(binomial(n-k, 7-2k), k=0..3). - 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), 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), n=1..32); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 29 2007
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CROSSREFS
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Adjacent sequences: A027927 A027928 A027929 this_sequence A027931 A027932 A027933
Sequence in context: A007835 A014396 A039671 this_sequence A038200 A030015 A103446
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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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