A030429 - OEIS

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A030429

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).

1, 2, 7, 26, 115, 596, 3331, 19100, 110329, 638540, 3697405, 21411974, 124001893, 718129334, 4158891979, 24085338398, 139485124807, 807798504728, 4678193659303, 27092766081872, 156902006957821 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`Hypothetical numbers of terms in general expressions for Lovelock tensors. Hypothetical extension of sequence A006373 - C. C. Briggs (ccb104(AT)psu.edu)`
	LINKS	`C. C. Briggs, Some Possible Features of General Expressions for Lovelock Tensors ...` `Index to sequences with linear recurrences with constant coefficients, signature (9,-22,21,-7).`
	FORMULA	`Expansion of (1-7x+11x^2-14x^3)/((1-7x+7x^2)(x-1)^2).` `a(n) = 2(23A030240(n)-133A030240(n-1)) -9n -45. - R. J. Mathar, Mar 14 2011`
	CROSSREFS	`Cf. A006373.` `Sequence in context: A150590 A202830 A006373 * A167551 A081566 A141203` `Adjacent sequences: A030426 A030427 A030428 * A030430 A030431 A030432`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.