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 A187701 Number of (n+1)X(n+1) 0..2 arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal 0
 31, 1489, 72, 5030, 36, 7410, 474, 176936 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A187705 LINKS Table of n, a(n) for n=1..8. EXAMPLE Some solutions for 4X4 ..0..2..0..0....0..0..1..1....0..0..2..1....0..2..0..0....0..0..1..0 ..0..1..1..1....2..1..1..1....2..1..2..1....0..2..1..2....2..2..1..0 ..2..2..2..0....1..1..1..2....0..1..2..2....1..2..1..0....1..2..1..2 ..0..0..1..0....1..1..0..0....0..1..0..0....0..0..1..0....1..2..0..0 CROSSREFS Sequence in context: A057008 A159487 A130661 * A185512 A221444 A185665 Adjacent sequences: A187698 A187699 A187700 * A187702 A187703 A187704 KEYWORD nonn AUTHOR R. H. Hardin Mar 12 2011 STATUS approved

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Last modified June 16 19:52 EDT 2024. Contains 373432 sequences. (Running on oeis4.)