The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A297603 Number of nX4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 1 or 3 neighboring 1s. 1
13, 96, 787, 6413, 52512, 429491, 3514058, 28752016, 235246416, 1924772818, 15748396926, 128852570569, 1054265189419, 8625944461642, 70577040980468, 577457778340216, 4724730328967287, 38657504527139644, 316293746374084822 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A297607.
LINKS
FORMULA
Empirical: a(n) = 10*a(n-1) -15*a(n-2) +23*a(n-3) -194*a(n-4) +70*a(n-5) +255*a(n-6) +963*a(n-7) +726*a(n-8) -4023*a(n-9) -2056*a(n-10) +3928*a(n-11) +5067*a(n-12) -6036*a(n-13) -3432*a(n-14) +6721*a(n-15) +3158*a(n-16) -5982*a(n-17) -1559*a(n-18) +1385*a(n-19) +3525*a(n-20) -2268*a(n-21) -1131*a(n-22) +957*a(n-23) +179*a(n-24) -244*a(n-25) -33*a(n-26) +33*a(n-27) +6*a(n-28) -2*a(n-29) +2*a(n-30) +a(n-31) -a(n-32)
EXAMPLE
Some solutions for n=5
..1..1..0..1. .1..0..1..0. .0..0..1..0. .0..0..0..0. .0..0..0..0
..1..0..1..1. .0..0..0..1. .1..1..1..0. .0..0..0..1. .0..0..0..0
..1..0..0..0. .1..1..0..0. .0..0..0..0. .1..0..0..0. .0..0..1..1
..0..0..0..1. .0..0..0..0. .0..0..1..0. .0..0..1..0. .0..0..0..0
..0..0..0..0. .1..1..0..1. .1..1..1..0. .0..0..0..0. .0..0..1..0
CROSSREFS
Cf. A297607.
Sequence in context: A320282 A366484 A297081 * A094499 A242385 A141894
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 01 2018
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 May 24 03:29 EDT 2024. Contains 372771 sequences. (Running on oeis4.)