45018

Appears in sequences

• G.f.: A(x) = x/(1 - x - G001190(x^2)), where G001190 is the g.f. of A001190, the Wedderburn-Etherington numbers (binary rooted trees).at n=19A093126
• Expansion of solution to an algebraic functional equation.at n=9A113299
• Number of quadruples [i,j,k,l] with all entries between 1 and n such that gcd(i,j) = gcd(k,l).at n=17A124162
• Positive integers n that are equal to the determinant of the circulant matrix formed by the decimal digits of n.at n=21A219324
• Positive integers m that are equal to the determinant of the circulant matrix formed by the decimal digits of m in reverse order.at n=21A219326
• Positive integers k that are equal to the absolute value of the determinant of the circulant matrix formed by the decimal digits of k.at n=23A219327
• Positive integers m that are equal to the determinant of the left circulant matrix formed by the decimal digits of m.at n=12A348428