A187531 - OEIS

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A187531

Number of 5X5 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation

0, 1476, 20554, 273102, 992410, 5880944 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	COMMENTS	`Row 4 of A187528`
	LINKS	`Table of n, a(n) for n=1..6.`
	EXAMPLE	`Some solutions for 5X5` `..2..3..3..0..3....3..3..1..0..1....2..0..2..1..3....0..2..1..0..1` `..3..0..1..3..0....1..0..1..3..1....1..1..1..0..2....1..0..1..2..0` `..2..3..2..3..1....3..3..2..3..2....2..1..2..1..2....1..2..2..2..1` `..1..3..1..0..3....2..3..1..0..1....2..0..1..1..1....0..2..1..0..1` `..3..0..3..3..1....1..0..1..3..3....1..1..2..0..2....1..2..2..2..2`
	CROSSREFS	`Sequence in context: A187310 A167575 A157505 * A188363 A159719 A052167` `Adjacent sequences: A187528 A187529 A187530 * A187532 A187533 A187534`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Mar 10 2011`
	STATUS	`approved`

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Last modified May 26 02:03 EDT 2013. Contains 225652 sequences.