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 A234778 Number of (n+1)X(n+1) 0..3 arrays with no adjacent elements equal and with each 2X2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases 1
 76, 6660, 2761748, 5465582060, 51845281856108, 2363085244017636364, 518342328616619031217020, 547728179121316322465056282212, 2790190676549838064460970840259520660 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A234786 LINKS R. H. Hardin, Table of n, a(n) for n = 1..10 EXAMPLE Some solutions for n=2 ..2..3..1....3..2..1....1..2..3....0..3..2....2..1..3....3..1..3....3..0..1 ..3..1..0....1..0..2....0..1..2....3..2..0....1..0..2....0..2..1....0..2..3 ..1..2..1....3..2..1....1..2..1....0..3..2....0..2..3....3..0..2....2..0..2 CROSSREFS Sequence in context: A004299 A049669 A198476 * A139671 A098606 A093276 Adjacent sequences:  A234775 A234776 A234777 * A234779 A234780 A234781 KEYWORD nonn AUTHOR R. H. Hardin, Dec 30 2013 STATUS approved

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Last modified October 17 08:36 EDT 2019. Contains 328107 sequences. (Running on oeis4.)