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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A208268 Number of nX7 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors 1
64, 4021, 273205, 18403423, 1240971177, 83670667271, 5641457245533, 380372051615157, 25646375739266275, 1729192685453990877, 116589859961103508219, 7861006788319434001589, 530024032549172830292655 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A208269

LINKS

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

FORMULA

Empirical: a(n) = 77*a(n-1) -429*a(n-2) -16791*a(n-3) +132938*a(n-4) +1140609*a(n-5) -11250708*a(n-6) -21101443*a(n-7) +356560316*a(n-8) -276630106*a(n-9) -3595865197*a(n-10) +5253257444*a(n-11) +16399879057*a(n-12) -30419637636*a(n-13) -37486637674*a(n-14) +87632998667*a(n-15) +40083109062*a(n-16) -140235056122*a(n-17) -7589163210*a(n-18) +128111780723*a(n-19) -23221600421*a(n-20) -65939015129*a(n-21) +21868944788*a(n-22) +18307048178*a(n-23) -8259596531*a(n-24) -2431120428*a(n-25) +1497147381*a(n-26) +85285300*a(n-27) -123174410*a(n-28) +8581030*a(n-29) +3300116*a(n-30) -512304*a(n-31) +18304*a(n-32)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A282314 A228984 A222385 * A184759 A324491 A107627

Adjacent sequences:  A208265 A208266 A208267 * A208269 A208270 A208271

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 24 2012

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 September 20 08:08 EDT 2019. Contains 327214 sequences. (Running on oeis4.)