918155951

Appears in sequences

• a(n) = (F(3*n+1) - 1)/2, where F=A000045 (the Fibonacci sequence).at n=15A049651
• Expansion of (1 + x)^2/((1 + x + x^2)*(1 + 3*x + x^2)).at n=22A113066
• a(n) = 3*a(n-1) + 5*a(n-2) + a(n-3), with a(0) = a(1) = 1 and a(2) = 7, a linear recurrence which is a trisection of A005252.at n=15A294262
• Expansion of (1 - x + x^2)/((1 - x + x^2)^2 - 4*x^2).at n=22A376716
• Lower (1/2)-midsequence of (F(2n)) and (F(2n+1)), where F=A000045 (Fibonacci numbers); see Comments.at n=22A387778