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A027813
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14*(n+1)*C(n+5,8).
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0
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56, 630, 3780, 16170, 55440, 162162, 420420, 990990, 2162160, 4424420, 8576568, 15872220, 28217280, 48430620, 80582040, 130423524, 205931880, 317983050, 481180700, 714864150, 1044323280, 1502250750, 2130464700
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OFFSET
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3,1
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LINKS
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Table of n, a(n) for n=3..25.
Index to sequences with linear recurrences with constant coefficients, signature (10,-45,120,-210,252,-210,120,-45,10,-1).
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FORMULA
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Number of 14-subsequences of [ 1, n ] with just 5 contiguous pairs; g.f. 14*(4+5x)*x^3/(1-x)^10
C(n+4, 4)*C(n+8, 5) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 26 2005
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CROSSREFS
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Sequence in context: A027793 A055747 A219475 * A199914 A190535 A190604
Adjacent sequences: A027810 A027811 A027812 * A027814 A027815 A027816
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KEYWORD
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nonn,easy,changed
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AUTHOR
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thi ngoc dinh (via R. K. Guy)
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STATUS
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approved
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