Number of (n+1)X(3+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally or vertically, with no adjacent elements equal.
A232401
Number of (n+1)X(3+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally or vertically, with no adjacent elements equal.
Terms
- a(0) =8a(1) =20a(2) =52a(3) =176a(4) =484a(5) =1500a(6) =4416a(7) =13220a(8) =39524a(9) =117892a(10) =352408a(11) =1052272a(12) =3143372a(13) =9389000a(14) =28044172a(15) =83767512a(16) =250208044a(17) =747361736a(18) =2232332800a(19) =6667874240a(20) =19916631536a(21) =59490043068a(22) =177693992608a(23) =530763654360
External references
- oeis: A232401