Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west, northwest or northeast neighbor modulo 3 and the upper left element equal to 0.
A266494
Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west, northwest or northeast neighbor modulo 3 and the upper left element equal to 0.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =4a(6) =13a(7) =43a(8) =126a(9) =324a(10) =778a(11) =1793a(12) =3987a(13) =8829a(14) =19834a(15) =45595a(16) =108018a(17) =262830a(18) =649760a(19) =1616712a(20) =4017230a(21) =9918783a(22) =24298995a(23) =59106475a(24) =143053466a(25) =345488182a(26) =834978806a(27) =2023884376a(28) =4926308771a(29) =12044390596
External references
- oeis: A266494