407253

Appears in sequences

• Consider 2n tennis players; a(n) is the number of matches needed to let every possible pair play each other.at n=20A062346
• a(n) = lcm(n, n+1, n+2, n+3, n+4) / 60.at n=40A067048
• Triangular numbers that remain triangular when the least significant digit is moved to the beginning.at n=16A068071
• G.f.: (2*x^2+4*x+3)/((2*x+2)*sqrt(-4*x^3-4*x^2+1))-1/(2*x+2).at n=17A247171
• 32*a(n) is the denominator of the squared circumradius of a cyclic quadrilateral with sides n, n+1, n+2, n+3.at n=40A351697