login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A207456 Number of 5 X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 0 1 vertically. 1
10, 100, 270, 1450, 5200, 23530, 92610, 396100, 1610950, 6754210, 27799200, 115710130, 478341370, 1985702500, 8222193630, 34098329530, 141276194800, 585672013210, 2427100765650, 10060368444100, 41694947333590 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 5 of A207453.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) + 13*a(n-2) + 4*a(n-3) - 16*a(n-4).

Empirical g.f.: 10*x*(1 + 9*x + 4*x^2 - 16*x^3) / (1 - x - 13*x^2 - 4*x^3 + 16*x^4). - Colin Barker, Jun 23 2018

EXAMPLE

Some solutions for n=5:

  1 1 1 1 1     1 0 1 1 0     0 1 0 1 0     0 1 0 1 0

  1 1 1 1 1     1 1 0 1 1     1 1 0 1 0     1 1 0 1 0

  0 1 0 1 1     0 1 0 1 0     1 1 0 1 0     0 1 0 1 0

  0 1 0 1 0     0 1 0 1 0     1 1 0 1 0     0 1 0 1 0

  0 1 0 1 0     0 1 0 1 0     1 1 0 1 0     0 1 0 1 0

CROSSREFS

Cf. A207453.

Sequence in context: A207602 A207028 A207173 * A208836 A208684 A207348

Adjacent sequences:  A207453 A207454 A207455 * A207457 A207458 A207459

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 17 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 18 00:50 EST 2022. Contains 350410 sequences. (Running on oeis4.)