26678

Appears in sequences

• Numbers k such that 6!*(2*k-7)!/(k!*(k-1)!) is an integer.at n=28A004786
• Numbers k such that 7!*(2k-8)!/(k!*(k-1)!) is an integer.at n=32A004787
• a(n) = number of new distinct proper angles with vertex and legs on grid points in an n X n square grid that were not found in an (n-1) X (n-1) square grid.at n=38A252592
• Self-composition of the Euler totient function (A000010).at n=11A307308