78176339

Appears in sequences

• a(n+2) = a(n+1) + a(n) + (-1)^n, with a(1) = a(2) = 1.at n=39A066983
• A Chebyshev transform of (1+3x)/(1-3x).at n=18A099858
• a(n) = 2*(A000045(n)-(n mod 2)) + 1 + (n mod 2).at n=38A166012
• Constant term in the reduction by (x^2 -> x + 1) of the polynomial p(n,x) defined below at Comments.at n=20A192908