Number of (n+1) X (1+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally, diagonally or antidiagonally, with no adjacent elements equal.
A232508
Number of (n+1) X (1+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally, diagonally or antidiagonally, with no adjacent elements equal.
Terms
- a(0) =4a(1) =4a(2) =8a(3) =16a(4) =28a(5) =52a(6) =96a(7) =176a(8) =324a(9) =596a(10) =1096a(11) =2016a(12) =3708a(13) =6820a(14) =12544a(15) =23072a(16) =42436a(17) =78052a(18) =143560a(19) =264048a(20) =485660a(21) =893268a(22) =1642976a(23) =3021904a(24) =5558148a(25) =10223028a(26) =18803080a(27) =34584256a(28) =63610364a(29) =116997700
External references
- oeis: A232508