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A096882
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Expansion of (1+7x)/(1-50x^2).
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1
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1, 7, 50, 350, 2500, 17500, 125000, 875000, 6250000, 43750000, 312500000, 2187500000, 15625000000, 109375000000, 781250000000, 5468750000000, 39062500000000, 273437500000000, 1953125000000000, 13671875000000000
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..19.
Index entries for linear recurrences with constant coefficients, signature (0,50).
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FORMULA
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a(n)=6a(n-1)+7a(n-2)+50^floor((n-2)/2); a(n)=sum{k=0..floor(n/2), binomial(floor(n/2), k)7^(n-2k) }.
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CROSSREFS
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Cf. A004663, A026383, A016116, A096881.
Sequence in context: A266360 A288787 A033117 * A033125 A022037 A054413
Adjacent sequences: A096879 A096880 A096881 * A096883 A096884 A096885
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry, Jul 14 2004
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STATUS
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approved
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