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 A054771 Number of nonnegative integer 3 X 3 matrices with sum of elements equal to n, up to rotational symmetry. 2
 1, 3, 13, 43, 129, 327, 761, 1619, 3238, 6098, 10974, 18930, 31550, 50930, 80030, 122666, 183999, 270525, 390755, 555205, 777287, 1073297, 1463583, 1972533, 2630044, 3471508, 4539660, 5884564, 7565868, 9652788, 12226860, 15381924 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Andrew Howroyd, Table of n, a(n) for n = 0..1000 FORMULA G.f.: (x^8 - 2*x^7 + 6*x^6 + 2*x^5 + 2*x^4 + 2*x^3 + 6*x^2 - 2*x + 1)/((1 - x^4)^2*(1 - x^2)^2*(1 - x)^5). CROSSREFS Row n=3 of A343874. Cf. A008610, A054343. Sequence in context: A247584 A049173 A049156 * A258776 A201710 A019008 Adjacent sequences: A054768 A054769 A054770 * A054772 A054773 A054774 KEYWORD easy,nonn AUTHOR Vladeta Jovovic, May 18 2000 STATUS approved

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Last modified March 30 11:15 EDT 2023. Contains 361618 sequences. (Running on oeis4.)