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 A187635 Number of 5X5 0..n arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular 0
 954, 557382, 31903442, 686589106, 7836968262 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 4 of A187633 LINKS EXAMPLE Some n=3 solutions for 5X5 ..2..0..2..1..2....2..0..2..1..2....2..0..2..3..2....2..0..2..0..2 ..0..1..0..1..0....0..3..0..3..0....0..2..0..2..0....0..2..2..2..2 ..1..2..3..1..1....3..0..2..0..3....2..2..1..1..2....3..0..1..0..3 ..0..1..0..1..0....0..3..1..3..1....0..2..0..2..0....0..2..0..2..2 ..2..1..2..0..2....2..3..3..3..3....2..0..2..3..2....2..0..2..1..3 CROSSREFS Sequence in context: A203024 A055161 A055158 * A076528 A260067 A031903 Adjacent sequences:  A187632 A187633 A187634 * A187636 A187637 A187638 KEYWORD nonn AUTHOR R. H. Hardin Mar 12 2011 STATUS approved

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