Number of (n+1)X(5+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements.

A251025

Number of (n+1)X(5+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements.

Terms

    a(0) =18330a(1) =60044a(2) =118871a(3) =257578a(4) =516684a(5) =1078862a(6) =2203974a(7) =4638560a(8) =9823382a(9) =21323795a(10) =46876790a(11) =104722539a(12) =236069897a(13) =536548809a(14) =1225050935a(15) =2806918650a(16) =6443646515a(17) =14812139786a(18) =34073066816a(19) =78416975906a(20) =180515457726

External references