A165397 - OEIS

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A165397

Number of slanted 5Xn (i=1..5)X(j=i..n+i-1) 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, 4 in the lower right corner, and with no element having more than 3 neighbors with the same value

7, 40, 2467, 18900, 174197, 1357468, 9996371, 68364692, 445699471, 2796474838, 16994094852 (list; graph; refs; listen; history; internal format)

	OFFSET	`2,1`
	EXAMPLE	`Some solutions for n=3` `...1.1.2...........1.1.2...........1.1.2...........1.1.2........` `.....1.2.2...........1.1.1...........1.2.2...........1.1.1......` `.......2.2.2...........1.1.1...........2.3.3...........1.1.1....` `.........4.4.4...........3.3.3...........3.3.4...........3.3.4..` `...........3.4.4...........3.3.4...........3.4.4...........3.4.4` `------` `...1.1.2...........1.2.2...........1.2.2...........1.1.2........` `.....1.1.1...........2.2.2...........2.2.2...........1.2.2......` `.......1.4.4...........3.3.3...........4.4.4...........3.3.3....` `.........4.4.4...........3.3.4...........4.4.4...........3.3.4..` `...........3.4.4...........3.4.4...........3.4.4...........3.4.4` `------` `...1.1.2...........1.1.2...........1.1.2...........1.2.2........` `.....1.2.2...........1.2.4...........1.1.4...........2.2.4......` `.......2.2.3...........2.4.4...........1.4.4...........2.4.4....` `.........3.3.4...........4.4.4...........4.4.4...........4.4.4..` `...........3.4.4...........3.4.4...........3.4.4...........3.4.4`
	CROSSREFS	`Sequence in context: A154968 A121582 A062727 * A123747 A144421 A023251` `Adjacent sequences: A165394 A165395 A165396 * A165398 A165399 A165400`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net) Sep 17 2009`

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Last modified February 14 01:35 EST 2012. Contains 205567 sequences.