Number of length n+2 0..4 arrays with no three unequal elements in a row and no three equal elements in a row and new values 0..4 introduced in 0..4 order.
A243723
Number of length n+2 0..4 arrays with no three unequal elements in a row and no three equal elements in a row and new values 0..4 introduced in 0..4 order.
Terms
- a(0) =3a(1) =6a(2) =12a(3) =25a(4) =53a(5) =116a(6) =259a(7) =593a(8) =1382a(9) =3281a(10) =7897a(11) =19252a(12) =47391a(13) =117645a(14) =293934a(15) =738341a(16) =1862341a(17) =4713220a(18) =11959211a(19) =30407929a(20) =77440630a(21) =197470825a(22) =504041249a(23) =1287558068a(24) =3291018759a(25) =8415888789a(26) =21529314366a(27) =55091691997a(28) =141006790829
External references
- oeis: A243723