Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,2,1,0,3 for x=0,1,2,3,4.
A197201
Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,2,1,0,3 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =5a(2) =16a(3) =47a(4) =154a(5) =496a(6) =1601a(7) =5183a(8) =16777a(9) =54298a(10) =175777a(11) =569008a(12) =1841952a(13) =5962675a(14) =19302067a(15) =62483633a(16) =202268864a(17) =654774451a(18) =2119602518a(19) =6861469468a(20) =22211599969a(21) =71902261547a(22) =232758343993a(23) =753473472226
External references
- oeis: A197201