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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A283946 Number of nX4 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element. 1
0, 16, 906, 16648, 283208, 4510608, 68693470, 1016922620, 14739946302, 210244817456, 2961229080584, 41284559423328, 570755049480396, 7835153742442852, 106914860440688980, 1451387421319840428 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A283950.

LINKS

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

FORMULA

Empirical: a(n) = 22*a(n-1) -79*a(n-2) -404*a(n-3) -1735*a(n-4) +5380*a(n-5) +19741*a(n-6) +34190*a(n-7) -114058*a(n-8) -262182*a(n-9) -147141*a(n-10) +773852*a(n-11) +1033244*a(n-12) -636288*a(n-13) -1952548*a(n-14) -773524*a(n-15) +3381918*a(n-16) +701852*a(n-17) -2086167*a(n-18) -1415394*a(n-19) +277411*a(n-20) +2329064*a(n-21) -1494802*a(n-22) +674022*a(n-23) -1245796*a(n-24) +983860*a(n-25) -532781*a(n-26) +405164*a(n-27) -201292*a(n-28) +71680*a(n-29) -28816*a(n-30) +7280*a(n-31) -1128*a(n-32) +96*a(n-33) -4*a(n-34)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A283950.

Sequence in context: A272468 A214386 A185561 * A289707 A006089 A260620

Adjacent sequences:  A283943 A283944 A283945 * A283947 A283948 A283949

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 18 2017

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 26 09:45 EDT 2022. Contains 354879 sequences. (Running on oeis4.)