Number of nX2 0..2 arrays with each element equal to either the sum mod 3 of its horizontal and vertical neighbors or the sum mod 3 of its diagonal and antidiagonal neighbors.
A183519
Number of nX2 0..2 arrays with each element equal to either the sum mod 3 of its horizontal and vertical neighbors or the sum mod 3 of its diagonal and antidiagonal neighbors.
Terms
- a(0) =3a(1) =9a(2) =31a(3) =95a(4) =309a(5) =911a(6) =2803a(7) =8673a(8) =26619a(9) =81959a(10) =252477a(11) =777327a(12) =2393627a(13) =7371657a(14) =22698115a(15) =69895583a(16) =215235669a(17) =662786215a(18) =2040959827a(19) =6284869089a(20) =19353386043a(21) =59596135287a(22) =183518286189a(23) =565119695167
External references
- oeis: A183519