Number of length n+2 0..n arrays with no three unequal elements in a row and new values 0..n introduced in 0..n order.
A243634
Number of length n+2 0..n arrays with no three unequal elements in a row and new values 0..n introduced in 0..n 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) =10137559a(16) =30920943a(17) =95457178a(18) =298128278a(19) =941574417a(20) =3006040523a(21) =9697677885a(22) =31602993021a(23) =104001763258a(24) =345524136076
External references
- oeis: A243634