Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west or southwest neighbor modulo 3 and the upper left element equal to 0.
A266905
Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west or southwest neighbor modulo 3 and the upper left element equal to 0.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =11a(4) =24a(5) =77a(6) =222a(7) =700a(8) =2297a(9) =6869a(10) =21609a(11) =71873a(12) =232180a(13) =750378a(14) =2467891a(15) =8112639a(16) =26801830a(17) =89117472a(18) =296172168a(19) =986748556a(20) =3302475620a(21) =11072842433a(22) =37184910085a(23) =125141998479a(24) =421837425707
External references
- oeis: A266905