login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A268999 Number of 5Xn binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once. 1
32, 379, 4083, 43512, 421450, 4097199, 38241770, 354861630, 3233293149, 29238488883, 261801167468, 2329097648405, 20588801089961, 181083224080162, 1585346158237184, 13824737077018333, 120130562347636272 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 5 of A268995.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 2*a(n-1) +97*a(n-2) +116*a(n-3) -2923*a(n-4) -10986*a(n-5) +4951*a(n-6) +72992*a(n-7) +36740*a(n-8) -223968*a(n-9) -159382*a(n-10) +423052*a(n-11) +256370*a(n-12) -539504*a(n-13) -176570*a(n-14) +450908*a(n-15) +6166*a(n-16) -217920*a(n-17) +57416*a(n-18) +45120*a(n-19) -25021*a(n-20) +562*a(n-21) +2089*a(n-22) -388*a(n-23) -31*a(n-24) +14*a(n-25) -a(n-26)

EXAMPLE

Some solutions for n=4

..0..0..0..0. .1..1..0..1. .1..0..0..1. .0..0..1..0. .0..1..0..0

..1..1..0..1. .0..1..0..0. .0..1..0..0. .1..0..1..1. .0..0..0..0

..0..1..0..0. .0..0..0..1. .1..0..0..1. .1..0..0..1. .0..0..0..1

..0..0..1..0. .1..0..0..0. .1..0..0..1. .1..0..0..1. .1..0..0..1

..0..0..0..1. .0..0..0..0. .0..0..0..1. .1..0..0..0. .0..0..0..1

CROSSREFS

Cf. A268995.

Sequence in context: A250170 A125420 A163690 * A280602 A301321 A300496

Adjacent sequences:  A268996 A268997 A268998 * A269000 A269001 A269002

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 17 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 July 18 19:00 EDT 2019. Contains 325144 sequences. (Running on oeis4.)