login
A223176
Number of (n+2)X4 0..1 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit
0
0, 4, 40, 348, 1200, 16348, 94364, 524292, 2621432, 16536796, 84487288, 391704968, 2328596100, 11355881256, 62051315756, 313489275420, 1569528616420, 8055413661476
OFFSET
1,2
EXAMPLE
All solutions for n=2
..1..0..1..1....1..1..0..1....1..1..0..1....1..0..1..1
..1..0..0..0....1..0..0..0....0..0..0..1....0..0..0..1
..0..0..0..1....0..0..0..1....1..0..0..0....1..0..0..0
..1..1..0..1....1..0..1..1....1..0..1..1....1..1..0..1
CROSSREFS
Column 2 of A223179.
Sequence in context: A121126 A145730 A069721 * A279574 A327675 A191681
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Mar 17 2013
STATUS
approved