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!)
A268903 Number of nX7 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once. 1
576, 34344, 1585800, 66210264, 2611960344, 99308573208, 3679171151832, 133712637011640, 4788143315276472, 169455769674019992, 5940079034652505944, 206577531186380751096, 7136252899974195705720, 245118805391945325271896 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A268904.

LINKS

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

FORMULA

Empirical: a(n) = 84*a(n-1) -2466*a(n-2) +31428*a(n-3) -206469*a(n-4) +750384*a(n-5) -1513404*a(n-6) +1574640*a(n-7) -656100*a(n-8)

EXAMPLE

Some solutions for n=2

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

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

CROSSREFS

Cf. A268904.

Sequence in context: A230522 A223301 A168660 * A249688 A079396 A299414

Adjacent sequences:  A268900 A268901 A268902 * A268904 A268905 A268906

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 15 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 1 07:28 EDT 2022. Contains 357135 sequences. (Running on oeis4.)