Number of n X 2 0..2 arrays with every element equal to either the sum mod 3 of its vertical neighbors or the sum mod 3 of its horizontal neighbors.
A183476
Number of n X 2 0..2 arrays with every element equal to either the sum mod 3 of its vertical neighbors or the sum mod 3 of its horizontal neighbors.
Terms
- a(0) =3a(1) =15a(2) =39a(3) =135a(4) =495a(5) =1647a(6) =5751a(7) =20223a(8) =70119a(9) =244863a(10) =855927a(11) =2985903a(12) =10426887a(13) =36416223a(14) =127148535a(15) =444006927a(16) =1550518119a(17) =5414352255a(18) =18907098327a(19) =66024403695a(20) =230558764743a(21) =805118884191
External references
- oeis: A183476