Number of (n+1)X(n+1) 0..1 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements.

A251121

Number of (n+1)X(n+1) 0..1 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements.

Terms

    a(0) =10a(1) =40a(2) =108a(3) =266a(4) =580a(5) =1214a(6) =2420a(7) =4702a(8) =8926a(9) =16680a(10) =30766a(11) =56180a(12) =101734a(13) =182956a(14) =327080a(15) =581742a(16) =1030000a(17) =1816290a(18) =3191136a(19) =5588050a(20) =9755530a(21) =16983260a(22) =29489098

External references