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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A260493 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011 0
 48, 136, 868, 3603, 5848, 31078, 155232, 356236, 1433220, 8676027, 28104408, 96675895, 569988256, 2581001066, 9580891800, 49283809387, 267771460624 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A260501 LINKS EXAMPLE Some solutions for n=4 ..1..0..0..1..0..0....1..1..0..0..1..1....1..1..0..0..0..1....1..0..0..0..0..0 ..1..0..0..1..0..0....0..1..0..0..1..0....0..1..0..0..1..0....1..1..0..0..1..0 ..0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..1 ..0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..1 ..0..0..1..1..0..0....0..1..1..0..0..1....0..1..0..0..1..0....0..0..1..0..0..0 ..0..0..0..0..0..0....0..0..0..0..0..0....1..1..0..0..0..1....0..0..1..0..1..1 CROSSREFS Cf. A260501 Sequence in context: A260833 A260972 A244380 * A003502 A129428 A039496 Adjacent sequences: A260490 A260491 A260492 * A260494 A260495 A260496 KEYWORD nonn AUTHOR R. H. Hardin, Jul 27 2015 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 23 15:56 EDT 2023. Contains 361445 sequences. (Running on oeis4.)