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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
 0, 1476, 20554, 273102, 992410, 5880944 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 4 of A187528 LINKS 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.