163185805

Appears in sequences

• Number of different configurations of an n-block of a shift space with k symbols where each symbol but the first must appear isolated and separated from others by a block of length at least m made of first symbols. Here k=19 and m=2.at n=15A131600
• a(n) = Sum_{k=0..floor(n/3)} n^k * binomial(n-2*k,k).at n=18A368891