A203823 Number of (n+1)X6 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements

944784, 252047376, 67240638864, 17968205387664, 4802315365587600, 1283572086126147216, 343078794839144051856, 91699807460715032147856, 24509991269729763610855056, 6551155815170345215277792400

Offset

1,1

Comments

Column 5 of A203826

Links

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

Formula

Empirical: a(n) = 303*a(n-1) -8127*a(n-2) -394891*a(n-3) +4091304*a(n-4) +21176820*a(n-5) -92236816*a(n-6)

Example

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

Crossrefs

Sequence in context: A203893 A345640 A346353 * A251911 A224593 A376473

Adjacent sequences: A203820 A203821 A203822 * A203824 A203825 A203826

Keyword

nonn

Author

R. H. Hardin Jan 06 2012

Status

approved