A203731 Number of (n+1)X5 0..7 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements

3240000, 681461824, 161916229056, 39986164706496, 9889622728751424, 2456635775400515136, 609221928288391040960, 151272719849511664491200, 37533436386104374598910784, 9317206985567286352629497920

Offset

1,1

Comments

Column 4 of A203732

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Formula

Empirical: a(n) = 141*a(n-1) +34391*a(n-2) -1914087*a(n-3) -5360404*a(n-4) +185626112*a(n-5) +226020536*a(n-6) -801895584*a(n-7)

Example

Some solutions for n=4
..3..6..2..5..1....1..1..7..7..0....1..2..4..2..6....3..1..0..0..5
..3..3..6..2..5....3..1..1..7..7....1..1..2..6..2....1..1..1..0..0
..7..3..3..6..2....5..3..1..1..7....0..1..1..2..0....7..1..7..1..0
..2..7..3..3..6....2..5..3..1..1....1..2..1..1..2....4..7..7..7..1
..0..2..7..3..3....6..2..5..3..1....5..1..1..7..1....1..4..7..0..7

Crossrefs

Sequence in context: A361613 A235211 A219335 * A138360 A206083 A199634

Adjacent sequences: A203728 A203729 A203730 * A203732 A203733 A203734

Keyword

nonn

Author

R. H. Hardin Jan 05 2012

Status

approved