

A253024


Number of (n+2)X(7+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


1



189, 243, 302, 369, 554, 720, 920, 1312, 1616, 1976, 2784, 3472, 4272, 6096, 7664, 9464, 13504, 16952, 20904, 29792, 37384, 46080, 65680, 82448, 101624, 144864, 181872, 224152, 319520, 401168, 494384, 704720, 884848, 1090392, 1554304
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OFFSET

1,1


COMMENTS

Column 7 of A253025


LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210


FORMULA

Empirical: a(n) = 3*a(n3) a(n6) a(n9) a(n12) a(n15) for n>20


EXAMPLE

Some solutions for n=4
..0..1..2..0..3..2..0..1..2....0..1..2..3..1..2..0..1..2
..0..0..0..0..0..0..0..0..0....2..2..2..2..2..2..2..2..2
..0..2..3..0..2..1..0..2..1....1..3..2..1..0..2..1..0..2
..0..3..2..0..1..2..0..1..2....3..1..2..0..1..2..0..1..2
..0..0..0..0..0..0..0..0..0....2..2..2..2..2..2..2..2..2
..0..2..1..0..2..1..0..2..1....1..0..2..1..0..2..1..0..2


CROSSREFS

Sequence in context: A065612 A088264 A068557 * A031901 A348160 A320709
Adjacent sequences: A253021 A253022 A253023 * A253025 A253026 A253027


KEYWORD

nonn


AUTHOR

R. H. Hardin, Dec 26 2014


STATUS

approved



