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!)
A247921 Number of length n+4 0..2 arrays with some disjoint pairs in every consecutive five terms having the same sum 1
203, 529, 1387, 3649, 9611, 25265, 66443, 174817, 460139, 1211409, 3189259, 8396641, 22107499, 58209297, 153270315, 403580257, 1062688075, 2798238641, 7368281835, 19402138145, 51089798827, 134530145105, 354246523595 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A247927

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) -2*a(n-3) -a(n-4) +6*a(n-5) -14*a(n-6) -13*a(n-7) -2*a(n-8) +8*a(n-9) -4*a(n-10) +8*a(n-11) +8*a(n-12)

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A259330 A090486 A228320 * A240903 A250751 A211565

Adjacent sequences:  A247918 A247919 A247920 * A247922 A247923 A247924

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 26 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 January 20 20:50 EST 2021. Contains 340332 sequences. (Running on oeis4.)