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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A283380 Number of nX2 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements. 1
 0, 1, 3, 19, 91, 399, 1734, 7257, 29754, 120018, 477678, 1880898, 7339875, 28425538, 109368210, 418413378, 1592767290, 6036395895, 22786979315, 85714057229, 321381104832, 1201482684424, 4479736531496, 16661729383449, 61830609817953 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Column 2 of A283386. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 9*a(n-1) -24*a(n-2) +18*a(n-3) -36*a(n-4) +111*a(n-5) -38*a(n-6) +150*a(n-7) -162*a(n-8) +135*a(n-9) -222*a(n-10) +177*a(n-11) -212*a(n-12) +186*a(n-13) -168*a(n-14) +160*a(n-15) -114*a(n-16) +99*a(n-17) -68*a(n-18) +48*a(n-19) -30*a(n-20) +16*a(n-21) -9*a(n-22) +3*a(n-23) -a(n-24) EXAMPLE Some solutions for n=4 ..0..1. .1..1. .0..0. .0..1. .1..1. .1..1. .0..1. .1..1. .1..1. .1..1 ..0..0. .1..1. .0..1. .1..1. .1..0. .0..0. .1..1. .0..1. .1..1. .1..1 ..1..1. .0..0. .1..1. .0..1. .1..1. .1..1. .1..0. .1..1. .0..0. .0..0 ..1..1. .0..1. .1..0. .1..1. .1..0. .1..1. .0..0. .0..1. .0..0. .1..0 CROSSREFS Cf. A283386. Sequence in context: A015528 A183384 A050863 * A049153 A074361 A126187 Adjacent sequences: A283377 A283378 A283379 * A283381 A283382 A283383 KEYWORD nonn AUTHOR R. H. Hardin, Mar 06 2017 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 October 1 11:02 EDT 2023. Contains 365819 sequences. (Running on oeis4.)