|
| |
|
|
A197617
|
|
Number of nX2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,3,1,1,1 for x=0,1,2,3,4
|
|
1
|
|
|
|
0, 0, 8, 0, 8, 32, 16, 64, 152, 160, 424, 832, 1216, 2688, 4968, 8384, 16936, 30944, 55440, 107072, 196152, 359776, 679880, 1251456, 2315136, 4330752, 8000840, 14842752, 27638984, 51176864, 95010832, 176575552, 327357272, 607795744
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,3
|
|
|
COMMENTS
|
Every 0 is next to 0 0's, every 1 is next to 1 3's, every 2 is next to 2 1's, every 3 is next to 3 1's, every 4 is next to 4 1's
Column 2 of A197623
|
|
|
LINKS
|
R. H. Hardin, Table of n, a(n) for n = 1..200
|
|
|
FORMULA
|
Empirical: a(n) = a(n-2) +4*a(n-3) +a(n-4)
|
|
|
EXAMPLE
|
All solutions for n=5
..0..1....1..0....1..2....1..0....1..2....2..1....2..1....0..1
..1..3....3..1....3..1....3..1....3..1....1..3....1..3....1..3
..1..1....1..1....1..1....1..1....1..1....1..1....1..1....1..1
..3..1....1..3....1..3....1..3....1..3....3..1....3..1....3..1
..1..0....0..1....0..1....2..1....2..1....1..0....1..2....1..2
|
|
|
CROSSREFS
|
Sequence in context: A165110 A055959 A076350 * A005076 A019863 A198820
Adjacent sequences: A197614 A197615 A197616 * A197618 A197619 A197620
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
R. H. Hardin Oct 16 2011
|
|
|
STATUS
|
approved
|
| |
|
|
