Number of 3Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 0 vertically.

A207112

Number of 3Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 0 vertically.

Terms

    a(0) =6a(1) =36a(2) =98a(3) =271a(4) =677a(5) =1504a(6) =3399a(7) =7220a(8) =15184a(9) =31664a(10) =64749a(11) =132543a(12) =268994a(13) =544151a(14) =1099824a(15) =2215226a(16) =4461522a(17) =8974915a(18) =18040615a(19) =36261642a(20) =72844037a(21) =146324852a(22) =293885650a(23) =590165228a(24) =1185140667a(25) =2379732659a(26) =4778367860a(27) =9594547523

External references