Number of 2 X n 0..2 arrays with every element plus 1 mod 3 equal to some element at offset (-1,-1) (-1,0) (-1,1) (0,-1) (0,1) or (1,0), with upper left element zero.
A278015
Number of 2 X n 0..2 arrays with every element plus 1 mod 3 equal to some element at offset (-1,-1) (-1,0) (-1,1) (0,-1) (0,1) or (1,0), with upper left element zero.
Terms
- a(0) =0a(1) =6a(2) =28a(3) =168a(4) =960a(5) =5530a(6) =31808a(7) =183000a(8) =1052800a(9) =6056806a(10) =34845028a(11) =200464768a(12) =1153281360a(13) =6634871130a(14) =38170663608a(15) =219597266000
External references
- oeis: A278015