287096238

Appears in sequences

• a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 2. Also a(n) = 3^n*C(n-1), where C = A000108 (Catalan numbers).at n=9A025226
• Expansion of (sqrt(1-12*x^2)+12*x^2+2*x-1)/(2*x*sqrt(1-12*x^2)).at n=19A103978
• a(n) = binomial(n+10, 10)*3^n.at n=8A172362
• Triangle read by rows: T(n,k) = 3^(n-k)*C(2*n,n-k).at n=46A386825