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 A223650 Number of (n+2)X6 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
 207, 3237, 427313, 22982345, 1119629805, 50246141433, 2434395476789, 75307144658325, 3271323310834015 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 6 of A223652 LINKS Table of n, a(n) for n=1..9. EXAMPLE Some solutions for n=3 ..1..0..1..1..1..1....1..0..1..1..1..1....1..1..1..0..0..1....1..1..0..0..1..1 ..0..0..0..0..0..1....0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0 ..1..0..0..1..1..0....1..0..0..0..1..0....1..1..1..0..0..0....1..0..0..0..1..0 ..0..0..1..0..0..1....1..0..0..1..0..0....0..0..0..0..0..0....1..0..0..1..0..0 ..1..1..0..1..1..1....1..1..0..1..1..1....1..1..1..1..1..1....1..1..1..1..1..1 CROSSREFS Sequence in context: A205198 A205194 A204868 * A232346 A052093 A103477 Adjacent sequences: A223647 A223648 A223649 * A223651 A223652 A223653 KEYWORD nonn AUTHOR R. H. Hardin Mar 25 2013 STATUS approved

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Last modified May 30 17:56 EDT 2024. Contains 372971 sequences. (Running on oeis4.)