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A096882 Expansion of (1+7x)/(1-50x^2). 1
1, 7, 50, 350, 2500, 17500, 125000, 875000, 6250000, 43750000, 312500000, 2187500000, 15625000000, 109375000000, 781250000000, 5468750000000, 39062500000000, 273437500000000, 1953125000000000, 13671875000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..19.

Index entries for linear recurrences with constant coefficients, signature (0,50).

FORMULA

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) }.

CROSSREFS

Cf. A004663, A026383, A016116, A096881.

Sequence in context: A266360 A288787 A033117 * A033125 A022037 A054413

Adjacent sequences:  A096879 A096880 A096881 * A096883 A096884 A096885

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Jul 14 2004

STATUS

approved

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Last modified February 20 00:28 EST 2019. Contains 320329 sequences. (Running on oeis4.)