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A203917 Number of (n+2)X4 0..1 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..1 introduced in row major order 1
392, 1682, 6050, 21632, 77618, 279752, 1008200, 3628818, 13056050, 46986818, 169132832, 608795618, 2191220000, 7886675232, 28386296450, 102170984882, 367744025618, 1323616564512, 4764074516450, 17147281548168, 61718049816200 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A203923

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +3*a(n-3) +16*a(n-4) +10*a(n-5) -16*a(n-6) -17*a(n-7) -5*a(n-8) -2*a(n-9) +a(n-10) for n>11

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A248022 A261379 A235313 * A180295 A166988 A264311

Adjacent sequences:  A203914 A203915 A203916 * A203918 A203919 A203920

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2012

STATUS

approved

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Last modified May 24 19:38 EDT 2022. Contains 354043 sequences. (Running on oeis4.)