id:A055194 - OEIS Search Results

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Number of 3 X n binary matrices with distinct rows, up to row and column permutation; (n,3)-hypergraphs (including empty hyperedge but excluding multiple hyperedges).

+0
2

3, 16, 52, 134, 302, 614, 1159, 2064, 3504, 5716, 9018, 13818, 20643, 30158, 43190, 60758, 84110, 114746, 154469, 205422, 270132, 351562, 453172, 578962, 733551, 922238, 1151072, 1426932, 1757618, 2151920, 2619731, 3172138, 3821524 (list; graph; listen)

	OFFSET	`2,1`
	FORMULA	`G.f. : -x^2(x^8-2x^6-2x^5+4x^3-4x-3)/((x^3-1)^2(x^2-1)^2*(x-1)^4).`
	CROSSREFS	`Cf. A002727.` `Sequence in context: A089363 A000574 A041233 this_sequence A027540 A099851 A005550` `Adjacent sequences: A055191 A055192 A055193 this_sequence A055195 A055196 A055197`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 30 2000`
	EXTENSIONS	`More terms from James A. Sellers (sellersj(AT)math.psu.edu), Jul 04 2000`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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