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A223649 Number of (n+2)X5 0..1 arrays with all rows having a nonnegative second derivative, and all and columns having a positive second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative 0
77, 799, 40981, 1044311, 24559913, 569451603, 13134713511, 219299436501, 4713184697381, 96531089206559, 1824338893531024, 31421788959150494 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A223652
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0..1..1....1..1..1..1..1....1..0..1..1..1....1..1..1..1..1
..0..0..0..0..0....0..0..0..0..0....1..0..1..0..1....1..1..0..0..1
..0..1..0..0..1....0..0..0..0..1....1..0..0..1..0....0..0..0..0..1
..0..0..0..1..1....0..0..0..0..0....0..1..0..0..1....0..0..0..0..0
..1..1..1..0..1....0..0..1..0..1....1..1..1..1..1....0..1..0..1..1
CROSSREFS
Sequence in context: A059047 A046149 A222728 * A205434 A125581 A176632
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 25 2013
STATUS
approved

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Last modified May 29 03:48 EDT 2024. Contains 372921 sequences. (Running on oeis4.)