53912

Appears in sequences

• Denominators of continued fraction convergents to sqrt(497).at n=9A041949
• Integer part of the area of circles with prime radii.at n=31A097427
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (0, 1, -1), (1, 0, 0), (1, 1, 1)}.at n=9A150126
• Number of partitions where the number of 1's and 2's are equal.at n=56A174455
• a(n) = Sum_{1 <= i < j <= n} F(i)*F(j), where F(k) is the k-th Fibonacci number.at n=11A190173
• Row "sums" of triangle A245618, using the operation <+> defined in A245618.at n=21A249768
• Integers k such that there exists an integer 0<m<k such that sigma(m)^2 + sigma(k)^2 = 2*(m+k)^2.at n=17A385008
• a(n) is the number of 5 element sets of distinct integer-sided trapezoids whose base angles are 60 degrees that fill an equilateral triangular grid of side n units, where one trapezoid has a larger base of n units.at n=33A391453