206672

Appears in sequences

• a(n) = (7*3^n + 1)/2.at n=10A199109
• a(n) = (7*9^n + 1)/2.at n=5A199566
• Records in the numbers of representations of k^2 as x^2 - x*y + y^2, x > 2*y >= 0, corresponding to the numbers of grid points with squared radius A357302(n)^2 in an angular sector 0 <= phi < Pi/6 of the triangular lattice.at n=30A357303