|
|
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
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|