2516412

Appears in sequences

• Number of quaternary cubefree words of length n.at n=11A051043
• G.f.: A(x) = sin( Sum_{n>=0} 2^((2n+1)^2) * C(2n,n)/4^n * x^(2n+1)/(2n+1) ); alternating zeros omitted.at n=2A157315