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 A223655 Number of 5Xn 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
 13, 169, 343, 5751, 40981, 427313, 4854187, 44756637, 495471093, 7057443515, 81567865207, 907308467643, 12030980609035, 175766023364757 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 3 of A223652 LINKS Table of n, a(n) for n=1..14. EXAMPLE Some solutions for n=3 ..1..1..1....0..0..1....1..1..1....1..1..1....1..1..1....1..1..1....1..1..1 ..1..0..0....1..1..1....1..0..1....1..0..1....1..0..0....1..0..1....0..0..0 ..1..0..0....0..0..0....0..0..0....0..0..0....0..0..1....0..0..1....1..0..1 ..0..0..1....0..0..0....0..0..0....1..1..1....1..1..1....1..0..0....1..0..1 ..1..0..1....1..1..1....1..1..1....1..0..1....1..1..1....1..1..1....1..1..1 CROSSREFS Sequence in context: A207592 A207876 A207679 * A207685 A207511 A320459 Adjacent sequences: A223652 A223653 A223654 * A223656 A223657 A223658 KEYWORD nonn AUTHOR R. H. Hardin Mar 25 2013 STATUS approved

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Last modified December 8 13:46 EST 2023. Contains 367679 sequences. (Running on oeis4.)