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!)
 A228384 Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally or vertically. 1
 1, 2, 21, 382, 17578, 1755243, 402968942, 207573951234, 242284444195349, 638096588519781536, 3798652903378388363280, 51076133156779686951912785, 1551660182965034835583479000348, 106488245934766828340647881986248382 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A228390 LINKS R. H. Hardin, Table of n, a(n) for n = 1..30 EXAMPLE Some solutions for n=4 ..1..0..0..0....1..0..0..1....1..0..1..0....1..0..0..1....1..0..0..0 ..0..0..0..1....0..0..1..0....0..1..0..0....0..0..0..0....0..0..1..0 ..0..0..1..0....0..0..0..0....0..0..0..1....1..0..1..0....1..0..0..1 ..0..0..0..1....0..1..0..0....0..1..0..0....0..1..0..1....0..0..1..0 CROSSREFS Sequence in context: A177234 A099710 A098344 * A216281 A263625 A245686 Adjacent sequences:  A228381 A228382 A228383 * A228385 A228386 A228387 KEYWORD nonn AUTHOR R. H. Hardin Aug 21 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 February 24 22:57 EST 2020. Contains 332216 sequences. (Running on oeis4.)