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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A193609 Number of n X n symmetric 0..2 arrays with no element equal to the sum mod 3 of all its horizontal and vertical neighbors 1
 2, 6, 64, 1026, 32832, 2097152, 268435456, 68719348224, 35184372089856, 36028797018963968, 73786976297388343296 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE Some solutions for 4X4 ..0..2..2..0....2..0..2..2....1..0..1..1....2..2..0..0....1..1..0..2 ..2..2..1..2....0..0..1..2....0..2..2..1....2..1..2..2....1..2..1..1 ..2..1..2..2....2..1..1..0....1..2..2..0....0..2..1..2....0..1..0..0 ..0..2..2..0....2..2..0..1....1..1..0..1....0..2..2..0....2..1..0..1 CROSSREFS Sequence in context: A347949 A241590 A052522 * A061999 A066756 A070872 Adjacent sequences:  A193606 A193607 A193608 * A193610 A193611 A193612 KEYWORD nonn AUTHOR R. H. Hardin Jul 31 2011 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 January 25 16:00 EST 2022. Contains 350572 sequences. (Running on oeis4.)