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 A196786 T(n,k) = Number of n X k 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,4,3,0,1 for x=0,1,2,3,4. 7
 1, 1, 1, 1, 1, 1, 1, 3, 3, 1, 1, 7, 17, 7, 1, 1, 17, 39, 39, 17, 1, 1, 41, 135, 145, 135, 41, 1, 1, 99, 427, 797, 797, 427, 99, 1, 1, 239, 1351, 3569, 6137, 3569, 1351, 239, 1, 1, 577, 4319, 17175, 40749, 40749, 17175, 4319, 577, 1, 1, 1393, 13715, 81389, 289761, 404589 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,8 COMMENTS Every 0 is next to 0 2's, every 1 is next to 1 4's, every 2 is next to 2 3's, every 3 is next to 3 0's, every 4 is next to 4 1's. Table starts .1....1.....1.......1........1..........1............1..............1 .1....1.....3.......7.......17.........41...........99............239 .1....3....17......39......135........427.........1351...........4319 .1....7....39.....145......797.......3569........17175..........81389 .1...17...135.....797.....6137......40749.......289761........2025511 .1...41...427....3569....40749.....404589......4216301.......43457133 .1...99..1351...17175...289761....4216301.....65282256......993629439 .1..239..4319...81389..2025511...43457133....993629439....22331701461 .1..577.13715..385231.14215709..448071435..15177736646...503549631381 .1.1393.43607.1829101.99646153.4621262139.231779144185.11344988022025 LINKS R. H. Hardin, Table of n, a(n) for n = 1..264 EXAMPLE Some solutions for n=6, k=4 ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..3..0 ..0..3..0..0....0..3..0..3....0..3..0..3....3..0..3..0....0..0..0..3 ..0..3..0..0....0..3..0..0....0..3..0..0....0..0..3..0....0..0..3..0 ..3..0..0..0....3..0..0..0....0..0..0..0....3..0..0..0....0..0..3..0 ..0..0..0..3....0..0..0..3....0..0..0..3....0..0..0..0....0..0..0..3 ..0..3..0..0....0..3..0..0....0..0..3..0....0..0..0..0....0..0..0..0 CROSSREFS Column 2 is A001333(n-1). Sequence in context: A196578 A196809 A101842 * A196746 A196904 A197373 Adjacent sequences: A196783 A196784 A196785 * A196787 A196788 A196789 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Oct 06 2011 STATUS approved

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Last modified March 23 20:04 EDT 2023. Contains 361452 sequences. (Running on oeis4.)