7080928

Appears in sequences

• a(n) = 2*binomial(3*n, n) - Sum_{k=0..n} binomial(3*n, k).at n=10A047098
• Number of reachable arrangements of coins in the game Blet starting with 2n coins.at n=13A075273
• Expansion of f(x^3)/(1-x*f(x^3)), where f(x) is the g.f. of A001764, whose n-th term is binomial(3n,n)/(2n+1).at n=30A126042
• Sequence s_n arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition).at n=18A129873