|
|
A223223
|
|
Number of nX4 0..1 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative
|
|
0
|
|
|
11, 121, 280, 3926, 26376, 251110, 2272864, 22449494, 215688364, 2635210346, 26127577834, 269923989830, 2987354654601, 35395852343115
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=3
..1..1..0..0....1..0..1..1....1..1..1..1....1..1..0..1....1..0..0..1
..0..0..0..0....1..0..0..1....1..0..0..0....1..0..0..0....1..0..0..1
..0..0..1..1....1..1..0..1....1..0..1..0....1..0..0..0....1..1..0..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|