Number of 1 X n 0..3 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value.

A267975

Number of 1 X n 0..3 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value.

Terms

    a(0) =4a(1) =16a(2) =64a(3) =250a(4) =964a(5) =3674a(6) =13868a(7) =51917a(8) =192980a(9) =712868a(10) =2618876a(11) =9573915a(12) =34845780a(13) =126322410a(14) =456285828a(15) =1642687662a(16) =5895922368a(17) =21102304252a(18) =75332038300a(19) =268275675007a(20) =953247943192

External references