Number of length n+2 0..8 arrays with no three unequal elements in a row and new values 0..8 introduced in 0..8 order.
A243639
Number of length n+2 0..8 arrays with no three unequal elements in a row and new values 0..8 introduced in 0..8 order.
Terms
- a(0) =4a(1) =9a(2) =21a(3) =51a(4) =127a(5) =324a(6) =844a(7) =2243a(8) =6073a(9) =16737a(10) =46905a(11) =133556a(12) =386062a(13) =1132107a(14) =3365627a(15) =10137558a(16) =30920924a(17) =95456942a(18) =298125982a(19) =941555265a(20) =3005897555a(21) =9696696210a(22) =31596681866a(23) =103963289341a(24) =345299662267
External references
- oeis: A243639