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 A209511 T(n,k)=Half the number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock having two or four distinct clockwise edge differences 8
 9, 27, 27, 81, 123, 81, 243, 561, 561, 243, 729, 2559, 3906, 2559, 729, 2187, 11673, 27225, 27225, 11673, 2187, 6561, 53247, 189801, 290493, 189801, 53247, 6561, 19683, 242889, 1323270, 3102219, 3102219, 1323270, 242889, 19683, 59049, 1107951 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts .....9......27.......81........243..........729...........2187............6561 ....27.....123......561.......2559........11673..........53247..........242889 ....81.....561.....3906......27225.......189801........1323270.........9225765 ...243....2559....27225.....290493......3102219.......33137271.......353991129 ...729...11673...189801....3102219.....50798448......832374135.....13642432110 ..2187...53247..1323270...33137271....832374135....20934997854....526815563193 ..6561..242889..9225765..353991129..13642432110...526815563193..20362314816594 .19683.1107951.64321641.3781613733.223616134827.13259938040553.787378099628577 LINKS R. H. Hardin, Table of n, a(n) for n = 1..364 EXAMPLE Some solutions for n=4 k=3 ..2..0..1..0....0..2..1..2....2..1..2..0....2..1..2..1....0..1..2..1 ..1..2..0..2....1..0..2..1....0..2..0..1....1..2..0..2....2..0..1..2 ..0..1..2..1....2..1..0..2....1..0..2..0....2..0..2..1....0..1..2..1 ..2..0..1..2....0..2..1..0....2..1..0..2....1..2..0..2....2..0..1..2 ..0..2..0..1....2..0..2..1....0..2..1..0....2..0..1..0....0..1..0..1 CROSSREFS Sequence in context: A205973 A122985 A255622 * A115148 A022701 A276003 Adjacent sequences:  A209508 A209509 A209510 * A209512 A209513 A209514 KEYWORD nonn,tabl AUTHOR R. H. Hardin Mar 09 2012 STATUS approved

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Last modified May 9 15:34 EDT 2021. Contains 343742 sequences. (Running on oeis4.)