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

13, 169, 343, 5751, 40981, 427313, 4854187, 44756637, 495471093, 7057443515, 81567865207, 907308467643, 12030980609035, 175766023364757

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