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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A223179

LINKS

Table of n, a(n) for n=1..18.

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

Sequence in context: A121126 A145730 A069721 * A279574 A327675 A191681

Adjacent sequences:  A223173 A223174 A223175 * A223177 A223178 A223179

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 17 2013

STATUS

approved

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Last modified October 15 19:25 EDT 2019. Contains 328037 sequences. (Running on oeis4.)