T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit.

A223179

T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =4a(5) =0a(6) =0a(7) =40a(8) =40a(9) =0a(10) =0a(11) =348a(12) =2076a(13) =348a(14) =0a(15) =0a(16) =1200a(17) =48316a(18) =48316a(19) =1200a(20) =0a(21) =0a(22) =16348a(23) =620568a(24) =2485972a(25) =620568a(26) =16348a(27) =0a(28) =0a(29) =94364

External references