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

A253332

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

Terms

    a(0) =3249a(1) =9228a(2) =25659a(3) =74953a(4) =210417a(5) =600020a(6) =1660088a(7) =4590122a(8) =12462900a(9) =33364770a(10) =88332846a(11) =228094422a(12) =584261303a(13) =1450543774a(14) =3577232487a(15) =8532736844a(16) =20234227845a(17) =46437782630a(18) =106028484423a(19) =234761319957a(20) =517489800375

External references