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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A268760 Number of n X n binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once. 1
 0, 6, 56, 1148, 32056, 1552272, 127676872, 18045771274, 4495138018796, 1955829240647962, 1511334747222697904, 2064152526111916503300, 5022957354228609008158500, 21748481726801956896608976098 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A268766. LINKS R. H. Hardin, Table of n, a(n) for n = 1..26 EXAMPLE Some solutions for n=4 ..0..0..1..1. .0..0..0..0. .0..1..0..1. .0..0..0..1. .0..0..0..0 ..1..0..0..0. .1..0..0..0. .0..0..0..0. .1..1..0..0. .1..0..0..1 ..0..0..0..1. .0..0..0..1. .1..0..0..0. .0..0..0..1. .1..0..0..0 ..1..0..0..0. .0..1..0..1. .1..0..1..0. .0..1..0..0. .0..0..0..1 CROSSREFS Cf. A268766. Sequence in context: A185524 A122743 A241031 * A137032 A053421 A083696 Adjacent sequences: A268757 A268758 A268759 * A268761 A268762 A268763 KEYWORD nonn AUTHOR R. H. Hardin, Feb 13 2016 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 February 5 20:57 EST 2023. Contains 360087 sequences. (Running on oeis4.)