Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, southwest or northwest neighbor modulo 3 and the upper left element equal to 0.
A266879
Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, southwest or northwest neighbor modulo 3 and the upper left element equal to 0.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =11a(5) =26a(6) =46a(7) =121a(8) =400a(9) =1109a(10) =2924a(11) =7992a(12) =21954a(13) =61748a(14) =176647a(15) =499953a(16) =1409763a(17) =3999662a(18) =11391787a(19) =32574599a(20) =93459472a(21) =268336008a(22) =771070141a(23) =2219952038a(24) =6403510479a(25) =18502345738a(26) =53538515560a(27) =155090741042a(28) =449731074132
External references
- oeis: A266879