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Search: id:A111781
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| 1, 56, 2052, 63000, 1777050, 48149640, 1284709140, 34260506280, 921799753875, 25175488338000, 700755564108600, 19932553764723600, 580406741946731700, 17320767850295910000, 530112107596146075000, 16645556950225160958000
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OFFSET
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7,2
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FORMULA
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E.g.f. (1/sqrt(1-x^2))*((x/(1-x))^7)/7!.
a(n)=(n!/7!)*sum(binomial(2*k, k)*binomial(n-2*k-1, 6)/(4^k), k=0..floor((n-7)/2)), n>=7.
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CROSSREFS
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Sequence in context: A103726 A004387 A111597 this_sequence A124101 A003696 A042513
Adjacent sequences: A111778 A111779 A111780 this_sequence A111782 A111783 A111784
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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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