Number of length n+2 0..7 arrays with no three unequal elements in a row and new values 0..7 introduced in 0..7 order.
A243638
Number of length n+2 0..7 arrays with no three unequal elements in a row and new values 0..7 introduced in 0..7 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) =1132106a(14) =3365610a(15) =10137369a(16) =30919271a(17) =95444507a(18) =298042003a(19) =941032182a(20) =3002839544a(21) =9679707876a(22) =31506186516a(23) =103497873819a(24) =342976360273
External references
- oeis: A243638