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

A251022

Number of (n+1)X(2+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) =526a(1) =2546a(2) =8207a(3) =23404a(4) =60044a(5) =144737a(6) =334167a(7) =755336a(8) =1690491a(9) =3781186a(10) =8485355a(11) =19144607a(12) =43420578a(13) =98930808a(14) =226191116a(15) =518462850a(16) =1190424308a(17) =2736380757a(18) =6294485365a(19) =14485586642a(20) =33344734931a(21) =76769227278a(22) =176761167633

External references