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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A222270 Number of nX2 0..3 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order 2
 0, 0, 4, 13, 40, 162, 888, 3617, 18136, 81560, 407644, 1901375, 9349056, 44712494, 218395880, 1057844425, 5154076928, 25146813236, 122532346416, 600293886818, 2928771248408, 14383619678744, 70298507431888, 345790800489643 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Column 2 of A222275 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 EXAMPLE All solutions for n=3 ..0..1....0..0....0..1....0..0 ..1..1....0..0....0..0....0..0 ..1..1....1..0....0..0....0..1 CROSSREFS Sequence in context: A034742 A149424 A097112 * A351892 A213496 A220926 Adjacent sequences: A222267 A222268 A222269 * A222271 A222272 A222273 KEYWORD nonn AUTHOR R. H. Hardin Feb 14 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 February 26 07:39 EST 2024. Contains 370335 sequences. (Running on oeis4.)