login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A268897 Number of n X n 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once. 1
0, 36, 1584, 118584, 17194680, 5344944120, 3679171151832, 5729028666080112, 20420870331077074152, 167959998252207918469944, 3205098856567970748329302728, 142456755446316393140675874983544 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A268904.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..15

EXAMPLE

Some solutions for n=4

..2..0..1..0. .0..0..0..0. .2..1..2..1. .0..2..2..1. .1..0..1..2

..1..0..0..1. .1..0..0..0. .0..1..2..0. .1..2..2..2. .1..0..1..0

..1..0..0..0. .1..1..0..0. .2..2..1..2. .1..2..1..2. .1..0..1..2

..1..0..0..0. .0..0..0..0. .2..2..1..0. .2..2..2..2. .1..2..1..1

CROSSREFS

Cf. A268904.

Sequence in context: A099366 A095657 A209014 * A034996 A166770 A270602

Adjacent sequences:  A268894 A268895 A268896 * A268898 A268899 A268900

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 15 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 20 20:50 EST 2021. Contains 340332 sequences. (Running on oeis4.)