Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its northwest or southwest neighbor modulo 3 and the upper left element equal to 0.
A266573
Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its northwest or southwest neighbor modulo 3 and the upper left element equal to 0.
Terms
- a(0) =2a(1) =5a(2) =15a(3) =109a(4) =574a(5) =2840a(6) =13767a(7) =71646a(8) =390862a(9) =2170370a(10) =11989812a(11) =66094738a(12) =366119221a(13) =2044786962a(14) =11503587136a(15) =65003352026a(16) =368281990242
External references
- oeis: A266573