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 A187461 Number of (n+1)X(n+1) 0..4 arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric 0
 512, 84048, 100936174, 216668424092, 7540469990506332 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A187462 LINKS Table of n, a(n) for n=1..5. EXAMPLE Some solutions for 4X4 ..0..1..1..2....0..1..0..2....0..1..2..1....0..1..0..4....0..1..0..2 ..1..0..1..4....1..0..1..0....1..0..2..0....1..0..1..0....1..0..1..3 ..1..1..1..0....1..1..0..3....1..2..3..1....4..1..4..3....0..1..1..2 ..2..4..0..1....3..1..3..1....2..2..4..3....4..0..3..1....2..1..0..3 CROSSREFS Sequence in context: A186797 A183815 A013701 * A291461 A328200 A181244 Adjacent sequences: A187458 A187459 A187460 * A187462 A187463 A187464 KEYWORD nonn AUTHOR R. H. Hardin Mar 10 2011 STATUS approved

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Last modified October 2 11:11 EDT 2023. Contains 365833 sequences. (Running on oeis4.)