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!)
 A228476 Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or antidiagonally. 6
 1, 2, 14, 172, 4354, 211588, 20185842, 3737615288, 1349721589622, 948593164919044, 1298594593323021084, 3461591189556243601228, 17969903126848842785918376, 181660279488635404176787338286 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A228482 LINKS R. H. Hardin, Table of n, a(n) for n = 1..27 EXAMPLE Some solutions for n=4 ..1..0..0..1....1..0..0..1....1..0..0..0....1..0..1..0....1..0..0..0 ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..1..0..1 ..0..0..0..1....1..0..0..0....0..0..0..0....1..0..0..1....0..0..0..0 ..1..0..0..0....0..0..0..1....0..0..0..1....0..1..0..0....0..1..0..1 CROSSREFS Sequence in context: A046247 A141012 A235369 * A308449 A233224 A167014 Adjacent sequences:  A228473 A228474 A228475 * A228477 A228478 A228479 KEYWORD nonn AUTHOR R. H. Hardin Aug 22 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 May 18 07:01 EDT 2021. Contains 343994 sequences. (Running on oeis4.)