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 A209545 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences 1
 7, 105, 5075, 723636, 294738262, 345350598642, 1159953545419801, 11179084602659460822, 309007688117388883362757, 24500703075201459753727015849, 5572033834554753242178727061445290 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A209553 LINKS R. H. Hardin, Table of n, a(n) for n = 1..13 EXAMPLE Some solutions for n=4 ..0..2..0..2..0....2..3..0..1..2....2..3..0..1..2....3..0..3..0..3 ..2..0..2..0..2....3..2..1..2..1....3..2..1..0..1....0..3..0..3..0 ..0..2..0..2..0....2..1..0..1..2....2..1..2..3..2....1..2..1..2..1 ..2..0..2..0..2....1..2..1..0..1....3..0..1..2..3....2..3..0..3..2 ..0..2..0..2..0....0..1..0..1..0....0..3..2..1..0....3..2..1..2..3 CROSSREFS Sequence in context: A096131 A049210 A167814 * A002486 A203971 A145167 Adjacent sequences: A209542 A209543 A209544 * A209546 A209547 A209548 KEYWORD nonn AUTHOR R. H. Hardin Mar 10 2012 STATUS approved

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Last modified January 27 01:46 EST 2023. Contains 359836 sequences. (Running on oeis4.)