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Search: id:A064061
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| 429, 1430, 3432, 7072, 13260, 23256, 38760, 62016, 95931, 144210, 211508, 303600, 427570, 592020, 807300, 1085760, 1442025, 1893294, 2459664, 3164480, 4034712, 5101360, 6399888, 7970688, 9859575
(list; graph; listen)
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OFFSET
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0,1
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LINKS
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R. K. Guy, Catwalks, Sandsteps and Pascal Pyramids, J. Integer Seqs., Vol. 3 (2000), #00.1.6
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FORMULA
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a(n)= A009766(n+7, 7)= (n+1)*binomial(n+14, 6)/7.
G.f.: (429-2002*x+4004*x^2-4368*x^3+2730* x^4-924*x^5+132*x^6)/(1-x)^8; numerator polynomial is N(2;6, x) from A062991.
a(n)=C(n,7)-C(n,5),n>=13 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 25 2006
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MAPLE
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[seq(binomial(n, 7)-binomial(n, 5), n=13..37)]; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 25 2006
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CROSSREFS
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A064059 (seventh column).
Sequence in context: A030467 A034278 A116870 this_sequence A115133 A090200 A033279
Adjacent sequences: A064058 A064059 A064060 this_sequence A064062 A064063 A064064
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KEYWORD
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nonn,easy
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Sep 13 2001
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