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Search: id:A111783
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| 1, 90, 5005, 223740, 8886735, 329819490, 11775438675, 411859047600, 14282642924550, 495142102154700, 17259324931198350, 607418587742967000, 21648370208790575250, 783042495355599979500, 28791389550204705674250
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OFFSET
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9,2
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FORMULA
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E.g.f. (1/sqrt(1-x^2))*((x/(1-x))^9)/9!.
a(n)=(n!/9!)*sum(binomial(2*k, k)*binomial(n-2*k-1, 8)/(4^k), k=0..floor((n-9)/2)), n>=9.
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CROSSREFS
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Sequence in context: A035740 A017753 A111599 this_sequence A075918 A076010 A089513
Adjacent sequences: A111780 A111781 A111782 this_sequence A111784 A111785 A111786
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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_DOT_uni-karlsruhe_DOT_de), Aug 23 2005
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