Number of 2 X n 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero.
A231038
Number of 2 X n 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =4a(4) =0a(5) =32a(6) =80a(7) =560a(8) =2080a(9) =10720a(10) =46496a(11) =220896a(12) =998432a(13) =4634272a(14) =21207840a(15) =97791904a(16) =449099040a(17) =2066934176a(18) =9501790240a(19) =43707407520a(20) =200983135008a(21) =924361443232
External references
- oeis: A231038