id:A047937 - OEIS Search Results

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Number of 2-colorings of an n X n grid, up to rotational symmetry.

+0
10

1, 2, 6, 140, 16456, 8390720, 17179934976, 140737496748032, 4611686019501162496, 604462909807864344215552, 316912650057057631849169289216, 664613997892457937028364283517337600 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n) = (m^(n^2) + 2 m^((n^2 + 3 (n mod 2))/4) + m^((n^2 + (n mod 2))/2))/4, with m = 2`
	EXAMPLE	`a(2)=6 from` `00 10 11 10 11 11` `00 00 00 01 10 11`
	CROSSREFS	`Cf. A054247, A047937-A047945.` `Sequence in context: A156515 A090907 A159478 this_sequence A027731 A145143 A164764` `Adjacent sequences: A047934 A047935 A047936 this_sequence A047938 A047939 A047940`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`Robert W. Pratt (Rob.Pratt(AT)sas.com)`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

AT&T Labs Research