This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A233161 Number of n X n 0..7 arrays with no element x(i,j) adjacent to itself or value 7-x(i,j) horizontally, diagonally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 3 4 5 and 6, 2 appearing before 3 4 and 5, and 3 appearing before 4 in row major order (unlabelled 8-colorings with no clashing color pairs) 1
 1, 1, 96, 28672, 31457280, 133143986176, 2216615441596416, 146421031085069565952, 38534510500216304943759360, 40485591044789076510300958621696 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Diagonal of A233168 LINKS R. H. Hardin, Table of n, a(n) for n = 1..16 EXAMPLE Some solutions for n=4 ..0..1..0..2....0..1..2..1....0..1..2..1....0..1..7..1....0..1..2..6 ..3..5..3..6....5..3..7..3....5..3..0..3....2..3..5..3....5..3..0..4 ..0..6..0..2....0..6..5..6....0..6..2..1....1..7..6..7....7..6..5..1 ..4..2..3..6....2..4..7..3....5..3..0..4....4..5..3..5....5..4..7..3 CROSSREFS Sequence in context: A203489 A208794 A276099 * A269090 A232522 A296061 Adjacent sequences:  A233158 A233159 A233160 * A233162 A233163 A233164 KEYWORD nonn AUTHOR R. H. Hardin, Dec 05 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 15 05:43 EDT 2019. Contains 328026 sequences. (Running on oeis4.)