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A203731 Number of (n+1)X5 0..7 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements 1
3240000, 681461824, 161916229056, 39986164706496, 9889622728751424, 2456635775400515136, 609221928288391040960, 151272719849511664491200, 37533436386104374598910784, 9317206985567286352629497920 (list; graph; refs; listen; history; text; internal format)
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: A209715 A235211 A219335 * A138360 A206083 A199634

Adjacent sequences:  A203728 A203729 A203730 * A203732 A203733 A203734

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 05 2012

STATUS

approved

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Last modified July 30 19:33 EDT 2021. Contains 346359 sequences. (Running on oeis4.)