Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north or northeast neighbor modulo 3 and the upper left element equal to 0.
A266600
Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north or northeast neighbor modulo 3 and the upper left element equal to 0.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =83a(5) =410a(6) =2109a(7) =11097a(8) =59698a(9) =325240a(10) =1786820a(11) =9888567a(12) =55061514a(13) =308166631a(14) =1732444205a(15) =9777801332a(16) =55377818912a(17) =314616215640
External references
- oeis: A266600