Number of nonnegative integer arrays of length n+5 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value 3.
A211843
Number of nonnegative integer arrays of length n+5 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value 3.
Terms
- a(0) =1a(1) =7a(2) =35a(3) =147a(4) =561a(5) =2013a(6) =6936a(7) =23244a(8) =76434a(9) =248158a(10) =799178a(11) =2561866a(12) =8197109a(13) =26236283a(14) =84147409a(15) =270824081a(16) =875656255a(17) =2846900003a(18) =9313478684a(19) =30675454100a(20) =101762486216a(21) =340118043072
External references
- oeis: A211843