Number of (n+1)X(7+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw.

A253325

Number of (n+1)X(7+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw.

Terms

    a(0) =3249a(1) =17197a(2) =86922a(3) =185672a(4) =503944a(5) =797324a(6) =1660088a(7) =2516513a(8) =4869987a(9) =7734273a(10) =14919670a(11) =25495092a(12) =49930717a(13) =90999544a(14) =180464019a(15) =343236331a(16) =684939660a(17) =1334617667a(18) =2669247347a(19) =5267675675a(20) =10540870453a(21) =20938024856a(22) =41896374843

External references