Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,0,1 for x=0,1,2,3,4.
A197666
Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,0,1 for x=0,1,2,3,4.
Terms
- a(0) =3a(1) =9a(2) =22a(3) =71a(4) =217a(5) =642a(6) =1963a(7) =5963a(8) =18018a(9) =54753a(10) =166329a(11) =504940a(12) =1534985a(13) =4667983a(14) =14198968a(15) =43215503a(16) =131584139a(17) =400800484a(18) =1221337807a(19) =3723140135a(20) =11353757744a(21) =34635822651a(22) =105696236527a(23) =322652635812a(24) =985253141189
External references
- oeis: A197666