|
| |
|
|
A204708
|
|
Number of (n+1)X4 0..1 arrays with the permanents of all 2X2 subblocks equal and nonzero
|
|
1
|
|
|
|
25, 81, 257, 833, 2689, 8705, 28161, 91137, 294913, 954369, 3088385, 9994241, 32342017, 104660993, 338690049, 1096024065, 3546808321, 11477712897, 37142659073, 120196169729, 388962975745, 1258710630401, 4073273163777
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
Column 3 of A204713
|
|
|
LINKS
|
R. H. Hardin, Table of n, a(n) for n = 1..210
|
|
|
FORMULA
|
Empirical: a(n) = 3*a(n-1) +2*a(n-2) -4*a(n-3)
|
|
|
EXAMPLE
|
Some solutions for n=4
..1..1..1..0....0..1..1..1....1..0..1..0....1..1..0..1....0..1..0..1
..1..0..1..1....1..1..0..1....1..1..0..1....1..0..1..1....1..1..1..0
..1..1..0..1....1..0..1..1....1..0..1..0....0..1..1..0....1..0..1..1
..0..1..1..0....0..1..1..0....1..1..1..1....1..1..0..1....0..1..1..0
..1..0..1..1....1..0..1..1....0..1..0..1....1..0..1..1....1..1..0..1
|
|
|
CROSSREFS
|
Sequence in context: A134153 A223181 A016814 * A174623 A100487 A157530
Adjacent sequences: A204705 A204706 A204707 * A204709 A204710 A204711
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
R. H. Hardin Jan 18 2012
|
|
|
STATUS
|
approved
|
| |
|
|
