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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A231538 Number of n X 2 0..1 arrays with no element less than a strict majority of its horizontal, vertical and antidiagonal neighbors. 1
 2, 6, 20, 57, 164, 485, 1424, 4169, 12228, 35868, 105177, 308433, 904520, 2652574, 7778858, 22812126, 66898367, 196184665, 575326896, 1687191264, 4947820577, 14509871545, 42551335553, 124785126404, 365942162811, 1073154072467 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 4*a(n-1) - 4*a(n-2) + 5*a(n-3) - 8*a(n-4) + 3*a(n-5) - 2*a(n-6) + a(n-7) - a(n-8). Empirical g.f.: x*(2 - 2*x + 4*x^2 - 9*x^3 + 2*x^4 - x^5 + x^6 - x^7) / (1 - 4*x + 4*x^2 - 5*x^3 + 8*x^4 - 3*x^5 + 2*x^6 - x^7 + x^8). - Colin Barker, Sep 29 2018 EXAMPLE Some solutions for n=7:   0 1   1 0   1 1   0 1   1 1   1 0   0 1   0 0   0 0   1 0   0 1   0 0   1 1   0 0   0 0   0 0   0 1   0 0   1 0   0 0   0 0   0 1   0 0   1 0   0 0   0 1   0 1   0 0   0 0   1 1   1 0   0 0   0 0   0 0   1 1   1 1   0 0   1 0   1 1   1 0   0 1   0 1   1 0   0 1   1 1   1 1   1 0   1 0   1 1   0 0   0 0   1 0   0 0   0 0   0 0   0 0   0 0   0 0   1 0   0 0   0 0   0 0   0 1   0 0   0 0   0 0   0 1   0 1   0 0   0 0 CROSSREFS Column 2 of A231544. Sequence in context: A327414 A110295 A027294 * A082045 A005628 A000620 Adjacent sequences:  A231535 A231536 A231537 * A231539 A231540 A231541 KEYWORD nonn AUTHOR R. H. Hardin, Nov 10 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 August 16 23:53 EDT 2022. Contains 356169 sequences. (Running on oeis4.)