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A203918 Number of (n+2)X5 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
1400, 6050, 21470, 75272, 267066, 949442, 3376768, 12014802, 42694542, 151658528, 538889650, 1914938498, 6805082304, 24183722738, 85939263318, 305389881288, 1085227801658, 3856447692050, 13704254006336, 48699429237698 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A203923

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +7*a(n-3) -11*a(n-4) +34*a(n-5) +46*a(n-6) -74*a(n-7) -78*a(n-8) -92*a(n-9) +92*a(n-10) +92*a(n-11) -44*a(n-12) +40*a(n-13) +32*a(n-15) -16*a(n-16) for n>17

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A065214 A336738 A271549 * A178271 A271579 A271712

Adjacent sequences:  A203915 A203916 A203917 * A203919 A203920 A203921

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2012

STATUS

approved

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Last modified May 17 02:47 EDT 2022. Contains 353727 sequences. (Running on oeis4.)