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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A223120 Number of nX2 0..2 arrays with no more than floor(nX2/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order 1
 1, 10, 72, 664, 5376, 47968, 406400, 3585408, 30987264, 272565760, 2378450944, 20921604096, 183506403328, 1615798558720, 14215745994752, 125323120574464, 1104802314190848, 9750937675890688, 86084069811027968, 760548158573379584 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 2 of A223126 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 EXAMPLE Some solutions for n=3 ..0..0....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1 ..1..2....1..0....2..0....1..1....2..0....0..0....1..1....0..2....0..1....0..1 ..1..2....2..0....2..2....0..1....1..1....2..0....2..1....2..1....0..2....0..0 CROSSREFS Sequence in context: A155606 A181671 A058111 * A240275 A181402 A003366 Adjacent sequences: A223117 A223118 A223119 * A223121 A223122 A223123 KEYWORD nonn AUTHOR R. H. Hardin Mar 15 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 31 04:34 EDT 2023. Contains 361627 sequences. (Running on oeis4.)