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!)
 A199193 Number of n X n 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors 1
 1, 1, 114, 11734, 86954982, 329877369234 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Diagonal of A199201 LINKS EXAMPLE Some solutions for n=4 ..0..1..2..1....0..1..0..2....0..1..0..2....0..1..0..1....0..1..2..0 ..3..2..0..2....2..3..2..0....2..0..3..1....1..2..3..0....3..2..1..3 ..0..1..3..0....3..1..3..1....3..1..2..0....2..3..0..3....0..1..3..1 ..2..3..1..3....2..0..1..3....2..3..1..3....3..2..1..2....2..0..2..3 CROSSREFS Sequence in context: A112485 A220685 A199249 * A188694 A188507 A189616 Adjacent sequences:  A199190 A199191 A199192 * A199194 A199195 A199196 KEYWORD nonn AUTHOR R. H. Hardin Nov 03 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 March 29 15:16 EDT 2020. Contains 333107 sequences. (Running on oeis4.)