Number of (n+1)X(4+1) 0..1 arrays with nondecreasing sum of every two consecutive values in every row and column.

A250428

Number of (n+1)X(4+1) 0..1 arrays with nondecreasing sum of every two consecutive values in every row and column.

Terms

    a(0) =144a(1) =720a(2) =3600a(3) =12000a(4) =40000a(5) =105000a(6) =275625a(7) =617400a(8) =1382976a(9) =2765952a(10) =5531904a(11) =10160640a(12) =18662400a(13) =32076000a(14) =55130625a(15) =89842500a(16) =146410000a(17) =228399600a(18) =356303376a(19) =535927392a(20) =806105664a(21) =1175570760a(22) =1714374025a(23) =2434614000

External references