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 A253017 Number of (n+2)X(n+2) 0..3 arrays with every consecutive three elements in every row and column not having exactly two distinct values, and in every diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order 0
 25, 50, 133, 155, 327, 864, 920, 1832, 4672, 4880, 9424, 23552, 24320, 46080, 113664, 116480, 217856, 532480, 542720, 1005568, 2441216, 2478080, 4558848, 11010048, 11141120, 20381696, 49020928, 49479680 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A253025 LINKS Table of n, a(n) for n=1..28. EXAMPLE Some solutions for n=4 ..0..1..2..0..3..2....0..1..2..0..1..3....0..0..0..0..0..0....0..0..0..0..0..0 ..2..2..2..2..2..2....1..1..1..1..1..1....0..1..2..0..1..2....1..2..0..3..2..0 ..1..0..2..1..0..2....2..1..0..3..1..0....0..2..1..0..2..1....2..1..0..2..3..0 ..0..1..2..0..1..2....0..1..3..0..1..3....0..0..0..0..0..0....0..0..0..0..0..0 ..2..2..2..2..2..2....1..1..1..1..1..1....0..1..2..0..1..2....3..2..0..1..2..0 ..3..0..2..1..3..2....3..1..0..3..1..0....0..2..1..0..2..1....2..1..0..2..1..0 CROSSREFS Sequence in context: A232438 A360017 A034025 * A042236 A042238 A042234 Adjacent sequences: A253014 A253015 A253016 * A253018 A253019 A253020 KEYWORD nonn AUTHOR R. H. Hardin, Dec 26 2014 STATUS approved

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Last modified July 15 19:27 EDT 2024. Contains 374334 sequences. (Running on oeis4.)