Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west or southwest neighbor modulo 4 and the upper left element equal to 0.
A266906
Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west or southwest neighbor modulo 4 and the upper left element equal to 0.
Terms
- a(0) =2a(1) =13a(2) =102a(3) =1233a(4) =17773a(5) =295717a(6) =5288444a(7) =100047497a(8) =1969179263a(9) =39719367272a(10) =815220460187
External references
- oeis: A266906