262181

Appears in sequences

• Expansion of (2-2*x-x^2)/((1-2*x^2)*(1-x)^2).at n=36A016724
• a(n) = 2^n + 2*n + 1.at n=18A176691
• Expansion of 1/((1-x)^2*(1-2*x+2*x^2)).at n=34A279230
• a(n) = Sum_{k=1..n} gcd(k,n)^(k-2).at n=7A341036
• Expansion of Sum_{k>0} k * x^k / (1 - 2*x^(2*k)).at n=36A364035