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A203375 Number of (n+1)X6 0..1 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements 1
972, 15564, 253068, 4136292, 67731264, 1109832180, 18189909480, 298154846436, 4887277903812, 80111933563464, 1313194979326320, 21525927546323460, 352853780193705264, 5783993041849734792, 94811448308361126864 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A203378

LINKS

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

FORMULA

Empirical: a(n) = 30*a(n-1) -291*a(n-2) +1278*a(n-3) -2901*a(n-4) +3519*a(n-5) -2152*a(n-6) +516*a(n-7)

EXAMPLE

Some solutions for n=4

..0..1..1..0..1..1....0..0..1..1..0..0....0..0..1..0..1..1....1..0..0..1..0..1

..0..0..1..1..0..1....0..0..0..1..1..0....0..0..0..0..0..1....0..1..0..0..0..0

..0..1..1..0..0..0....1..0..1..0..1..1....1..0..0..0..0..0....0..0..1..0..1..0

..0..0..1..1..0..1....1..1..0..0..0..1....1..1..0..0..1..0....1..0..0..1..1..1

..0..1..1..0..1..0....1..0..0..0..1..0....1..1..1..0..0..1....0..1..0..0..1..1

CROSSREFS

Sequence in context: A171771 A206089 A217162 * A183359 A203030 A209045

Adjacent sequences:  A203372 A203373 A203374 * A203376 A203377 A203378

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 31 2011

STATUS

approved

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Last modified November 24 10:51 EST 2014. Contains 249895 sequences.