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 A222509 T(n,k)=Number of nXk 0..1 arrays with exactly floor(nXk/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order 12
 1, 0, 0, 0, 0, 0, 3, 4, 4, 0, 4, 3, 4, 11, 0, 4, 10, 15, 35, 8, 0, 5, 32, 35, 84, 87, 44, 0, 20, 44, 170, 423, 497, 496, 144, 0, 27, 176, 441, 1753, 2066, 2862, 1335, 352, 0, 48, 326, 2192, 8489, 17674, 23678, 15420, 7552, 692, 0, 63, 888, 5416, 39873, 81537, 195968, 128889 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,7 COMMENTS Table starts .1.....0.......0........3..........4...........4............5...........20 .0.....0.......4........3.........10..........32...........44..........176 .0.....4.......4.......15.........35.........170..........441.........2192 .0....11......35.......84........423........1753.........8489........39873 .0.....8......87......497.......2066.......17674........81537.......800040 .0....44.....496.....2862......23678......195968......1802656.....17117005 .0...144....1335....15420.....128889.....2220730.....19892241....385142640 .0...352....7552....86570....1529195....25587208....473772613...8962277166 .0...692...21382...484976....8569032...297738400...5455705052.212898244002 .0..2488..122942..2751326..102004630..3488244716.132847734428 .0..6476..348597.15597305..577797690.41065342664 .0.17095.2045395.89022483.6918500106 LINKS R. H. Hardin, Table of n, a(n) for n = 1..145 EXAMPLE Some solutions for n=3 k=4 ..0..0..0..0....0..0..1..1....0..0..0..0....0..1..1..1....0..1..1..0 ..0..0..0..0....0..0..1..1....0..0..0..0....1..1..1..1....1..1..1..1 ..0..1..0..1....0..0..1..1....0..0..1..1....1..1..1..0....1..1..1..1 CROSSREFS Column 2 is A222284 Row 1 is A222283 Sequence in context: A213201 A245843 A188729 * A222488 A222500 A177935 Adjacent sequences: A222506 A222507 A222508 * A222510 A222511 A222512 KEYWORD nonn,tabl AUTHOR R. H. Hardin Feb 23 2013 STATUS approved

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Last modified April 23 00:33 EDT 2024. Contains 371906 sequences. (Running on oeis4.)