11257501249
domain: N
Appears in sequences
- a(n) = 2*a(n-1) + 2*a(n-2) - a(n-3) with a(-1) = 1, a(0) = 1, a(1) = 1.at n=26A061646
- Coefficient of x in the reduction by (x^2->x+1) of the polynomial p(n,x) given in Comments.at n=25A192873
- Sum of the legs of the unique primitive Pythagorean triple (a,b,c) such that (a-b+c)/2 = A000045(n) and its long leg and hypotenuse are consecutive natural numbers.at n=25A382845