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A006372
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Numbers of terms in expressions for coefficients of "Lovelock Lagrangians" (or "Gauss-Bonnet forms") in terms of Riemann-Christoffel curvature tensor and two of its contractions (viz., the Ricci curvature tensor and the Riemann curvature scalar) for n-dimensional differentiable manifolds having a general linear connection.
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4
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..9.
C. Bogdanos, Diagrammatic derivation of Lovelock densities, Phys Rev. D 79 (10) (2009) 107501.
C. C. Briggs, A General Expression for the Quintic Lovelock Tensor, arXiv:gr-qc/9607033, 1996-1997.
C. C. Briggs, A General Expression for the Quartic Lovelock Tensor, arXiv:gr-qc/9703074, 1997.
R. J. Mathar, 2-regular digraphs of the Lovelock Lagrangian, arXiv:1903.12477 [math.GM], 2019.
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CROSSREFS
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Cf. A006373, A045900 (conjectural), A306892 (2-regular digraphs).
Sequence in context: A151426 A045900 A000738 * A148798 A148799 A148800
Adjacent sequences: A006369 A006370 A006371 * A006373 A006374 A006375
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KEYWORD
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nonn,more
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AUTHOR
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C. C. Briggs (ccb104(AT)vm.cac.psu.edu)
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EXTENSIONS
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a(6)-a(8) from R. J. Mathar, Apr 08 2019
a(9) added by R. J. Mathar, Apr 15 2019
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STATUS
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approved
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