login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

Number of (n+2)X4 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

%I #3 Mar 25 2013 07:28:37

%S 35,229,5751,78213,1059839,13505813,172509399,1684095249,20632590041,

%T 242227127509,2638617033260,26781324092906

%N Number of (n+2)X4 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

%C Column 4 of A223652

%e Some solutions for n=3

%e ..1..0..0..1....1..1..1..1....1..0..1..1....1..0..1..1....1..1..1..1

%e ..0..0..0..0....0..0..0..1....0..1..0..1....0..0..0..0....1..0..1..0

%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..1....1..0..0..1

%e ..0..0..1..1....1..1..0..1....1..0..1..0....1..0..1..0....0..0..1..1

%e ..1..1..1..1....1..1..1..1....1..1..0..1....0..1..0..1....1..1..1..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 25 2013