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 A222747 T(n,k)=Number of nXk 0..3 arrays with exactly floor(nXk/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order 10
 1, 0, 0, 0, 6, 0, 6, 32, 20, 0, 20, 657, 2438, 685, 0, 20, 7546, 126947, 125094, 5370, 0, 70, 124363, 6363724, 27397461, 6821264, 123410, 0, 685, 1710608, 390671426, 5989744766, 6178897165, 413021606, 1341616, 0, 2808, 26389570, 20825891902 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Table starts .1...........0................0....................6.....................20 .0...........6...............32..................657...................7546 .0..........20.............2438...............126947................6363724 .0.........685...........125094.............27397461.............5989744766 .0........5370..........6821264...........6178897165..........4906560167364 .0......123410........413021606........1424636571214.......4777709698876890 .0.....1341616......24065512554......332960192034230....4001484076145095954 .0....25106526....1471765337998....78562540663580982.4007703500495273447052 .0...321557310...87152464030990.18671065206165526715 .0..5447475968.5404644628233066 .0.76079350800 .0 LINKS R. H. Hardin, Table of n, a(n) for n = 1..82 EXAMPLE Some solutions for n=3 k=4 ..0..1..1..2....0..1..2..3....0..1..1..1....0..1..1..2....0..1..0..2 ..2..1..1..3....1..0..1..2....2..1..2..1....0..0..1..1....2..2..2..0 ..2..2..1..2....2..1..2..1....3..2..0..1....1..0..3..1....0..0..3..2 CROSSREFS Row 1 is A222604 Sequence in context: A280480 A223104 A222722 * A222608 A021900 A273413 Adjacent sequences:  A222744 A222745 A222746 * A222748 A222749 A222750 KEYWORD nonn,tabl AUTHOR R. H. Hardin Mar 04 2013 STATUS approved

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Last modified June 17 17:33 EDT 2021. Contains 345085 sequences. (Running on oeis4.)