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!)
A228734 Number of arrays of the median of three adjacent elements of some length n+2 0..2 array. 1
3, 9, 27, 77, 185, 447, 1071, 2593, 6333, 15513, 38039, 93213, 228279, 558849, 1367945, 3348489, 8196847, 20065943, 49122291, 120253773, 294386457, 720668887, 1764221329, 4318870217, 10572732933, 25882394413, 63360952825, 155109705901 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) -a(n-2) -2*a(n-3) +a(n-4) +5*a(n-5) -2*a(n-6) +a(n-7) +a(n-9) +a(n-10) -2*a(n-12) -a(n-13) +a(n-14)
EXAMPLE
Some solutions for n=4
..1..1..2..0..1..2..1..0..2..1..0..2..0..0..0..1
..2..2..1..2..2..1..0..2..2..2..0..1..2..2..1..0
..1..0..2..0..1..2..0..1..1..1..0..0..2..1..0..1
..1..0..0..0..2..2..0..1..1..0..2..1..1..2..0..2
CROSSREFS
Column 2 of A228740.
Sequence in context: A361423 A135415 A182897 * A048481 A269488 A027027
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 01 2013
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 March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)