A207251 - OEIS

A207251

Number of nX5 0..1 arrays avoiding 0 0 1 and 1 0 1 horizontally and 0 1 0 and 1 0 1 vertically

10, 100, 390, 1950, 9072, 43498, 206514, 982940, 4672690, 22223478, 105684192, 502611290, 2390250122, 11367287780, 54059152686, 257088257194, 1222630168560, 5814441801566, 27651641179470, 131502438430740, 625383900547134

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 5 of A207254

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +6*a(n-2) +a(n-3) +36*a(n-4) +49*a(n-5) +31*a(n-6) +66*a(n-7) +45*a(n-8) +15*a(n-9) -5*a(n-10) -16*a(n-11) -a(n-12) -a(n-13) +a(n-14)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207072 A207405 A207706 * A208289 A208365 A208144

Adjacent sequences: A207248 A207249 A207250 * A207252 A207253 A207254

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 16 2012

STATUS

approved