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 A183986 T(n,k)=1/4 the number of (n+1)X(k+1) binary arrays with all 2X2 subblock sums the same 10
 4, 6, 6, 9, 8, 9, 15, 11, 11, 15, 25, 17, 14, 17, 25, 45, 27, 20, 20, 27, 45, 81, 47, 30, 26, 30, 47, 81, 153, 83, 50, 36, 36, 50, 83, 153, 289, 155, 86, 56, 46, 56, 86, 155, 289, 561, 291, 158, 92, 66, 66, 92, 158, 291, 561, 1089, 563, 294, 164, 102, 86, 102, 164, 294, 563 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ...4...6...9..15..25..45..81.153.289..561.1089.2145.4225.8385.16641.33153.66049 ...6...8..11..17..27..47..83.155.291..563.1091.2147.4227.8387.16643.33155.66051 ...9..11..14..20..30..50..86.158.294..566.1094.2150.4230.8390.16646.33158.66054 ..15..17..20..26..36..56..92.164.300..572.1100.2156.4236.8396.16652.33164.66060 ..25..27..30..36..46..66.102.174.310..582.1110.2166.4246.8406.16662.33174.66070 ..45..47..50..56..66..86.122.194.330..602.1130.2186.4266.8426.16682.33194.66090 ..81..83..86..92.102.122.158.230.366..638.1166.2222.4302.8462.16718.33230.66126 .153.155.158.164.174.194.230.302.438..710.1238.2294.4374.8534.16790.33302.66198 .289.291.294.300.310.330.366.438.574..846.1374.2430.4510.8670.16926.33438.66334 .561.563.566.572.582.602.638.710.846.1118.1646.2702.4782.8942.17198.33710.66606 LINKS R. H. Hardin, Table of n, a(n) for n = 1..683 FORMULA Empirical, for every row and column: a(n)=3*a(n-1)-6*a(n-3)+4*a(n-4) EXAMPLE Some solutions for 6X5 ..0..1..0..0..1....1..1..1..1..1....1..1..0..0..1....1..1..0..1..0 ..1..0..1..1..0....1..0..1..0..1....0..0..1..1..0....0..0..1..0..1 ..0..1..0..0..1....1..1..1..1..1....1..1..0..0..1....1..1..0..1..0 ..1..0..1..1..0....0..1..0..1..0....0..0..1..1..0....0..0..1..0..1 ..0..1..0..0..1....1..1..1..1..1....1..1..0..0..1....1..1..0..1..0 ..1..0..1..1..0....0..1..0..1..0....0..0..1..1..0....0..0..1..0..1 CROSSREFS Sequence in context: A201775 A199172 A323674 * A160995 A215454 A155750 Adjacent sequences: A183983 A183984 A183985 * A183987 A183988 A183989 KEYWORD nonn,tabl AUTHOR R. H. Hardin Jan 08 2011 STATUS approved

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Last modified December 1 04:36 EST 2022. Contains 358454 sequences. (Running on oeis4.)