Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west or northeast neighbor modulo 3 and the upper left element equal to 0.
A266292
Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west or northeast neighbor modulo 3 and the upper left element equal to 0.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =12a(4) =33a(5) =97a(6) =278a(7) =821a(8) =2504a(9) =7766a(10) =24609a(11) =79116a(12) =256012a(13) =833076a(14) =2724322a(15) =8948557a(16) =29528100a(17) =97848681a(18) =325395649a(19) =1085321033a(20) =3629107776a(21) =12162007737a(22) =40841502890a(23) =137415398075a(24) =463180693482
External references
- oeis: A266292