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!)
A268627 Number of nX7 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once. 1
768, 29646, 982086, 30553014, 915847266, 26758514760, 767057092212, 21665715966234, 604770363515718, 16719464029955466, 458539471622171262, 12491032205839395768, 338309651358216576312, 9117289065936178169226 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A268628.

LINKS

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

FORMULA

Empirical: a(n) = 110*a(n-1) -5243*a(n-2) +144650*a(n-3) -2610593*a(n-4) +33017408*a(n-5) -305811128*a(n-6) +2137462184*a(n-7) -11513372884*a(n-8) +48502300256*a(n-9) -161412354008*a(n-10) +427044616576*a(n-11) -901108804624*a(n-12) +1517344261024*a(n-13) -2035022988048*a(n-14) +2164824966496*a(n-15) -1815145078160*a(n-16) +1189730382208*a(n-17) -603502277248*a(n-18) +234173991424*a(n-19) -68574152448*a(n-20) +14906358784*a(n-21) -2352277504*a(n-22) +260550656*a(n-23) -19140608*a(n-24) +835584*a(n-25) -16384*a(n-26)

EXAMPLE

Some solutions for n=2

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

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

CROSSREFS

Cf. A268628.

Sequence in context: A183687 A269051 A282287 * A170783 A268970 A204625

Adjacent sequences:  A268624 A268625 A268626 * A268628 A268629 A268630

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 09 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 May 30 05:35 EDT 2020. Contains 334712 sequences. (Running on oeis4.)