373734

Appears in sequences

• a(n)=3*a(n-1)+12*a(n-2) for n>=3, a(0)=1, a(1)=3, a(2)=18 .at n=8A133594
• a(n) = 3*a(n-1)+3*a(n-2) with a(0)=1 and a(1)=2.at n=10A202206
• Expansion of 1/(-x*sqrt(4*x^2+1)-x^2+1).at n=20A271318