228826128

Appears in sequences

• a(n) = 5*F(n)^2 + 3*(-1)^n where F(n) are the Fibonacci numbers A000045.at n=20A047946
• a(n) = Lucas(2*n) + 1.at n=20A065034
• Numbers having three 1's in their base-phi representation.at n=21A104626
• Duplicate of A065034.at n=20A107328
• Number of odd chordless cycles in the 2n-Moebius ladder graph.at n=20A301773