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

A251021

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

Terms

    a(0) =110a(1) =526a(2) =1966a(3) =6321a(4) =18330a(5) =49481a(6) =126955a(7) =314337a(8) =759223a(9) =1803024a(10) =4233655a(11) =9867700a(12) =22890708a(13) =52944048a(14) =122232716a(15) =281893771a(16) =649688256a(17) =1496798491a(18) =3447701193a(19) =7940432539a(20) =18286472653a(21) =42111425346a(22) =96975351381a(23) =223315141022

External references