The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A230903 Number of n X n 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero 0
 0, 2, 38, 802, 30304, 2121666, 271505344, 63341237848, 26993178279216 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A230910 LINKS EXAMPLE Some solutions for n=4 ..0..2..0..3....0..3..1..3....0..2..1..3....0..1..2..1....0..1..0..1 ..1..3..1..0....1..2..0..1....1..3..0..1....3..0..3..0....2..3..2..0 ..0..2..3..2....3..1..3..2....2..1..2..0....1..2..1..2....0..1..3..2 ..1..0..1..0....0..2..1..0....0..3..1..3....3..0..3..1....3..2..1..0 CROSSREFS Sequence in context: A262585 A208240 A075796 * A246000 A266601 A266597 Adjacent sequences:  A230900 A230901 A230902 * A230904 A230905 A230906 KEYWORD nonn AUTHOR R. H. Hardin, Nov 01 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 April 3 00:35 EDT 2020. Contains 333195 sequences. (Running on oeis4.)