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!)
A247989 Number of length n+5 0..2 arrays with no disjoint triples in any consecutive six terms having the same sum 1
396, 702, 1264, 2314, 4308, 8150, 15640, 30620, 60192, 118756, 235048, 466476, 927792, 1850424, 3692608, 7372360, 14725200, 29421656, 58802272, 117563504, 235061376, 470020240, 939884704, 1879539888, 3758751936, 7517176032 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A247995

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +10*a(n-6) -20*a(n-7) -16*a(n-12) +32*a(n-13)

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A278269 A278606 A230450 * A126078 A275171 A028299

Adjacent sequences:  A247986 A247987 A247988 * A247990 A247991 A247992

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 28 2014

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 22 02:48 EDT 2021. Contains 347605 sequences. (Running on oeis4.)