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A030429
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a(n+2) = 7*a(n+1) - 7*a(n) - 9*n; a(n+4) = 9*a(n+3) - 22*a(n+2) + 21*a(n+1) - 7*a(n).
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1
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1, 2, 7, 26, 115, 596, 3331, 19100, 110329, 638540, 3697405, 21411974, 124001893, 718129334, 4158891979, 24085338398, 139485124807, 807798504728, 4678193659303, 27092766081872, 156902006957821
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OFFSET
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0,2
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COMMENTS
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Hypothetical numbers of terms in general expressions for Lovelock tensors. Hypothetical extension of sequence A006373 - C. C. Briggs (ccb104(AT)psu.edu)
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LINKS
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FORMULA
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Expansion of (1-7*x+11*x^2-14*x^3)/((1-7*x+7*x^2)*(x-1)^2).
a(n) = 2*(23*A030240(n)-133*A030240(n-1)) -9*n -45. - R. J. Mathar, Mar 14 2011
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MATHEMATICA
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LinearRecurrence[{9, -22, 21, -7}, {1, 2, 7, 26}, 30] (* Harvey P. Dale, Oct 12 2015 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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