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A196661
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Expansion of (1-2x)/(1-7x).
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3
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1, 5, 35, 245, 1715, 12005, 84035, 588245, 4117715, 28824005, 201768035, 1412376245, 9886633715, 69206436005, 484445052035, 3391115364245, 23737807549715, 166164652848005, 1163152569936035, 8142067989552245, 56994475926865715, 398961331488060005
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OFFSET
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0,2
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LINKS
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FORMULA
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a(0) = 1, a(n) = 5*7^(n-1) for n>0.
a(n) = Sum_0<=k<=n{A193722(n,k)*2^k}.
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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