Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, southwest or southeast neighbor modulo 3 and the upper left element equal to 0.
A266922
Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, southwest or southeast neighbor modulo 3 and the upper left element equal to 0.
Terms
- a(0) =1a(1) =4a(2) =8a(3) =22a(4) =54a(5) =142a(6) =368a(7) =974a(8) =2596a(9) =6978a(10) =18956a(11) =51750a(12) =142624a(13) =394594a(14) =1099946a(15) =3076470a(16) =8654090a(17) =24416490a(18) =69188320a(19) =196569386a(20) =560336468a(21) =1600901762a(22) =4585812858a(23) =13161785906a(24) =37855003558a(25) =109058776534a(26) =314733656956
External references
- oeis: A266922