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 A238523 T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no element equal to all horizontal neighbors or equal to all vertical neighbors 6
 84, 588, 588, 7056, 9612, 7056, 74676, 345744, 345744, 74676, 812028, 10332060, 49787136, 10332060, 812028, 8777664, 321566028, 5576504976, 5576504976, 321566028, 8777664, 95006100, 9918146448, 659389472784, 2197236920100 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ......84........588...........7056..............74676.................812028 .....588.......9612.........345744...........10332060..............321566028 ....7056.....345744.......49787136.........5576504976...........659389472784 ...74676...10332060.....5576504976......2197236920100........926028739793772 ..812028..321566028...659389472784....926028739793772....1409574919301273724 .8777664.9918146448.77047385296896.384603811149627048.2108531560861406325624 LINKS R. H. Hardin, Table of n, a(n) for n = 1..71 FORMULA Empirical for column k: k=1: a(n) = 9*a(n-1) +21*a(n-2) -14*a(n-3) k=2: [order 12] k=3: [order 6] EXAMPLE Some solutions for n=2 k=4 ..2..0..3..1..0....2..0..0..1..0....2..0..0..2..1....2..0..0..2..3 ..0..2..0..2..3....0..2..1..3..2....0..2..3..3..0....0..2..2..1..2 ..1..3..1..0..2....1..3..2..1..0....2..0..2..0..1....3..1..3..2..3 CROSSREFS Sequence in context: A220203 A008429 A175813 * A238518 A264654 A230907 Adjacent sequences: A238520 A238521 A238522 * A238524 A238525 A238526 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Feb 28 2014 STATUS approved

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Last modified June 18 01:17 EDT 2024. Contains 373468 sequences. (Running on oeis4.)