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!)
 A228654 Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally. 1
 1, 2, 34, 416, 24109, 1482892, 337258048, 99770848656, 92600434253746, 128571982215641568, 497887042842429868023, 3189515020018986830642404, 52334113476786453501159739264, 1527284319716267796002249895255726 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A228660 LINKS R. H. Hardin, Table of n, a(n) for n = 1..29 EXAMPLE Some solutions for n=4 ..1..0..0..0....1..0..0..1....1..0..0..1....1..0..0..0....1..0..1..0 ..0..0..0..1....1..0..0..0....0..0..0..0....1..0..0..1....0..0..0..0 ..0..0..0..1....0..0..0..1....0..0..0..0....1..0..0..1....1..0..1..0 ..1..0..0..1....0..0..0..1....0..1..0..0....1..0..0..0....0..0..1..0 CROSSREFS Sequence in context: A224294 A092408 A180764 * A005261 A104898 A218432 Adjacent sequences:  A228651 A228652 A228653 * A228655 A228656 A228657 KEYWORD nonn AUTHOR R. H. Hardin Aug 29 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 January 28 07:07 EST 2020. Contains 331317 sequences. (Running on oeis4.)