id:A054771 - OEIS Search Results

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Number of nonnegative integer 3 X 3 matrices with sum of elements equal to n, up to rotational symmetry.

+0
1

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; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: (x^8 - 2x^7 + 6x^6 + 2x^5 + 2x^4 + 2x^3 + 6x^2 - 2x + 1)/((1 - x^4)^2(1 - x^2)^2*(1 - x)^5).`
	CROSSREFS	`Cf. A008610, A054343.` `Sequence in context: A084476 A049173 A049156 this_sequence A019008 A062609 A004660` `Adjacent sequences: A054768 A054769 A054770 this_sequence A054772 A054773 A054774`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), May 18 2000`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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