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 A223156 Number of (n+2)X4 0..2 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit 0
 989, 25929, 1328305, 55977857, 1853983303, 63763662879, 2163492588961 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A223157 LINKS Table of n, a(n) for n=1..7. EXAMPLE Some solutions for n=1 ..1..2..0..2....2..0..1..2....2..2..0..2....1..0..2..2....2..1..1..2 ..1..0..0..0....1..0..0..0....1..0..0..0....0..0..0..1....1..0..0..1 ..2..1..1..1....2..1..0..0....2..1..2..2....1..2..0..2....2..1..0..2 CROSSREFS Sequence in context: A232844 A057668 A217719 * A087702 A224565 A341604 Adjacent sequences: A223153 A223154 A223155 * A223157 A223158 A223159 KEYWORD nonn AUTHOR R. H. Hardin Mar 16 2013 STATUS approved

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Last modified August 11 21:40 EDT 2024. Contains 375073 sequences. (Running on oeis4.)