id:A064050 - OEIS Search Results

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Number of essentially different (not mappable to each other by reflection or rotation) arrangements of numbers 1 to n*(n+1)/2 in a triangle of n rows, in such a way that each row and each diagonal is increasing or decreasing.

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1, 1, 4, 30, 702, 76844 (list; graph; listen)

	OFFSET	`1,3`
	CROSSREFS	`a(n)=A64049(n)/6 for n>1.` `Sequence in context: A118792 A137341 A120338 this_sequence A119926 A103307 A025416` `Adjacent sequences: A064047 A064048 A064049 this_sequence A064051 A064052 A064053`
	KEYWORD	`more,nonn`
	AUTHOR	`Floor van Lamoen (fvlamoen(AT)hotmail.com), Aug 24 2001`

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Last modified November 30 22:12 EST 2008. Contains 150989 sequences.

AT&T Labs Research