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!)
A268797 Number of nX7 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once. 1
576, 4360, 41248, 561116, 7801688, 104971262, 1384570516, 17967375416, 230262982692, 2921020155826, 36745483472428, 459003330021886, 5699362152372404, 70403795917829390, 865796392149477244 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A268798.

LINKS

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

R. H. Hardin, Empirical recurrence of order 68

FORMULA

Empirical recurrence of order 68 (see link above)

EXAMPLE

Some solutions for n=3

..2..2..1..2..2..2..2. .1..2..2..2..2..1..2. .2..2..2..1..1..2..2

..1..2..2..2..1..2..1. .2..1..2..2..2..2..2. .1..2..2..2..2..2..2

..2..1..2..1..2..2..2. .1..2..2..2..1..2..2. .2..1..2..2..2..1..2

CROSSREFS

Cf. A268798.

Sequence in context: A281242 A067225 A325475 * A036514 A269034 A188787

Adjacent sequences:  A268794 A268795 A268796 * A268798 A268799 A268800

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 13 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 5 21:00 EDT 2020. Contains 335473 sequences. (Running on oeis4.)