id:A054549 - OEIS Search Results

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Number of symmetric nonnegative integer 9x9 matrices with sum of elements equal to 4*n, under action of dihedral group D_4.

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1, 9, 51, 219, 786, 2466, 6974, 18126, 43929, 100321, 217683, 451707, 901128, 1735752, 3239928, 5878328, 10393902, 17950878, 30340682, 50273658, 81787476, 130811124, 205935756, 319456044, 488764246, 738197766, 1101468114 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: 1/((1-x)^9*(1-x^2)^6).`
	CROSSREFS	`Cf. A001753, A038163.` `Sequence in context: A034816 A140381 A055900 this_sequence A005746 A061178 A097789` `Adjacent sequences: A054546 A054547 A054548 this_sequence A054550 A054551 A054552`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), May 14 2000`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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