Number of nX4 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

A224154

Number of nX4 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

Terms

    a(0) =11a(1) =56a(2) =187a(3) =574a(4) =1783a(5) =5657a(6) =18408a(7) =61140a(8) =205390a(9) =694018a(10) =2350061a(11) =7961090a(12) =26964678a(13) =91303265a(14) =309082754a(15) =1046163241a(16) =3540718751a(17) =11983122960a(18) =40555030532a(19) =137252283821a(20) =464510611475

External references