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Search: id:A111780
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| 1, 42, 1204, 29736, 689850, 15647940, 354718980, 8137289160, 190349674515, 4561677870750, 112317990384600, 2846259737521200, 74306186469414900, 1999421553976446600, 55458660913310655000, 1585528821898619598000
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OFFSET
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6,2
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FORMULA
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E.g.f. (1/sqrt(1-x^2))*((x/(1-x))^6)/6!.
a(n)=(n!/6!)*sum(binomial(2*k, k)*binomial(n-2*k-1, 5)/(4^k), k=0..floor((n-6)/2)), n>=6.
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CROSSREFS
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Sequence in context: A004361 A004373 A001778 this_sequence A075922 A077123 A121974
Adjacent sequences: A111777 A111778 A111779 this_sequence A111781 A111782 A111783
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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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