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Search: id:A027928
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| 1, 3, 8, 20, 46, 97, 189, 344, 591, 967, 1518, 2300, 3380, 4837, 6763, 9264, 12461, 16491, 21508, 27684, 35210, 44297, 55177, 68104, 83355, 101231, 122058, 146188, 174000, 205901, 242327, 283744, 330649, 383571, 443072
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OFFSET
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3,2
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FORMULA
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(n-2)(n^4-8n^3+39n^2-92n+180)/120.
a(n)=C(n,n-1)+C(n+1,n-2)+C(n+2,n-3), 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), n=1..35); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 29 2007
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CROSSREFS
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Sequence in context: A014628 A034504 A140481 this_sequence A026624 A026690 A036676
Adjacent sequences: A027925 A027926 A027927 this_sequence A027929 A027930 A027931
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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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