Number of 2Xn arrays containing n copies of 0..2-1 avoiding the pattern down-up in every row and column.

A269506

Number of 2Xn arrays containing n copies of 0..2-1 avoiding the pattern down-up in every row and column.

Terms

    a(0) =2a(1) =6a(2) =14a(3) =34a(4) =92a(5) =258a(6) =722a(7) =2022a(8) =5706a(9) =16232a(10) =46442a(11) =133418a(12) =384550a(13) =1111614a(14) =3221582a(15) =9357450a(16) =27233148a(17) =79394646a(18) =231822854a(19) =677835636a(20) =1984435484a(21) =5816254262a(22) =17064740572a(23) =50114985298a(24) =147303657830a(25) =433319078074

External references