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A252858 Number of (n+2)X(5+2) 0..2 arrays with every consecutive three elements in every row, column, diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order 1
4383, 2502, 3582, 7002, 14229, 28728, 58644, 119727, 245016, 501462, 1027503, 2103156, 4308210, 8823537, 18075114, 37017972, 75824523, 155304774, 318115530, 651566331, 1334582154, 2733553872, 5599070757, 11468280366, 23490006084 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A252861

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +2*a(n-2) +4*a(n-4) -4*a(n-5) -7*a(n-6) -a(n-7) +3*a(n-8) +9*a(n-9) -3*a(n-10) -3*a(n-11) -2*a(n-12) +2*a(n-14) +a(n-15) -a(n-16) for n>18

EXAMPLE

Some solutions for n=4

..0..1..0..0..2..2..1....0..1..0..0..2..2..1....0..0..1..1..2..2..0

..2..0..0..1..0..1..0....2..2..0..0..1..0..1....1..1..0..0..2..0..2

..2..1..1..0..0..1..1....0..2..2..1..1..0..0....0..1..0..1..1..2..2

..1..0..1..0..1..0..1....2..0..0..1..0..1..0....0..2..2..1..1..0..1

..1..1..2..2..1..1..2....2..0..2..2..1..1..2....2..2..0..2..0..0..1

..0..0..2..0..2..0..2....1..1..2..2..0..2..0....0..0..2..2..1..1..0

CROSSREFS

Sequence in context: A203874 A205317 A252645 * A027506 A152931 A045013

Adjacent sequences:  A252855 A252856 A252857 * A252859 A252860 A252861

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 23 2014

STATUS

approved

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Last modified May 7 15:02 EDT 2021. Contains 343650 sequences. (Running on oeis4.)