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 A187704 Number of (n+1)X(n+1) 0..5 arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal 0
 170, 93476, 2904, 4225652, 12898 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 5 of A187705 LINKS EXAMPLE Some solutions for 4X4 ..3..2..0..0....0..0..1..0....2..2..4..0....1..1..0..0....2..2..4..0 ..3..2..2..4....3..2..1..0....5..5..5..0....1..1..2..4....2..2..2..0 ..5..2..2..2....2..2..1..2....0..2..2..2....3..1..2..3....0..2..2..2 ..0..0..2..2....4..4..1..2....0..5..0..0....0..0..2..3....0..4..2..2 CROSSREFS Sequence in context: A098244 A250957 A114048 * A263059 A243294 A015975 Adjacent sequences:  A187701 A187702 A187703 * A187705 A187706 A187707 KEYWORD nonn AUTHOR R. H. Hardin Mar 12 2011 STATUS approved

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Last modified June 25 09:38 EDT 2022. Contains 354835 sequences. (Running on oeis4.)