198100

Appears in sequences

• a(0) = 1, for n>=1, a(n) = Sum_{k=0..n} 9^k*N(n,k), where N(n,k) = (1/n)*C(n,k)*C(n,k+1) are the Narayana numbers (A001263).at n=6A082181
• a(n) = N(6,n), where N(6,x) is the 6th Narayana polynomial.at n=9A090199
• Structured triakis icosahedral numbers (vertex structure 4).at n=27A100172
• Numbers k such that sigma(k) = psi(k) + phi(k) + omega(k)^7.at n=3A389972