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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A232311 Number of (n+1)X(3+1) 0..1 arrays with every element equal to some horizontal or antidiagonal neighbor, with top left element zero 1
 16, 139, 1202, 10409, 90157, 780922, 6764246, 58591124, 507509767, 4395993154, 38077604237, 329823977717, 2856898655026, 24746138781034, 214348305112232, 1856661207278099, 16082193123986242, 139302170295461137 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A232316 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 10*a(n-1) -11*a(n-2) -5*a(n-3) -a(n-4). Empirical: G.f.: -x*(-16+21*x+12*x^2+2*x^3) / ( 1-10*x+11*x^2+5*x^3+x^4 ). - R. J. Mathar, Nov 24 2013 EXAMPLE Some.solutions.for.n=5 ..0..0..0..0....0..0..1..0....0..0..0..0....0..0..1..0....0..0..0..0 ..0..1..1..1....0..1..0..0....0..0..0..0....1..1..0..0....0..1..1..1 ..0..0..0..0....1..1..1..0....1..1..0..0....1..1..1..0....1..1..1..0 ..1..1..0..0....0..0..0..1....0..0..1..0....1..0..0..1....0..0..0..0 ..1..0..1..1....0..0..1..1....0..1..0..1....0..1..1..0....1..1..1..0 ..1..1..1..1....1..1..1..1....1..1..1..1....1..0..0..0....1..0..0..0 CROSSREFS Sequence in context: A300934 A300878 A301488 * A048533 A303145 A213349 Adjacent sequences: A232308 A232309 A232310 * A232312 A232313 A232314 KEYWORD nonn AUTHOR R. H. Hardin, Nov 22 2013 STATUS approved

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

Last modified March 25 10:30 EDT 2023. Contains 361520 sequences. (Running on oeis4.)