Number of length n+2 0..6 arrays with no three unequal elements in a row and new values 0..6 introduced in 0..6 order.
A243637
Number of length n+2 0..6 arrays with no three unequal elements in a row and new values 0..6 introduced in 0..6 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) =133555a(12) =386047a(13) =1131958a(14) =3364454a(15) =10129563a(16) =30871733a(17) =95176427a(18) =296618011a(19) =933821451a(20) =2967726939a(21) =9514201392a(22) =30747183016a(23) =100097739315a(24) =328049191105
External references
- oeis: A243637