Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its northwest or northeast neighbor modulo 4 and the upper left element equal to 0.
A266683
Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its northwest or northeast neighbor modulo 4 and the upper left element equal to 0.
Terms
- a(0) =6a(1) =101a(2) =2520a(3) =77830a(4) =2643025a(5) =96489721a(6) =3689693411a(7) =146213224799
External references
- oeis: A266683