177466

Appears in sequences

• Rectangular array T(n,m), read by upward antidiagonals: T(n,m) is the number of difunctional (regular) binary relations between an n-element set and an m-element set.at n=48A265417
• Rectangular array T(n,m), read by upward antidiagonals: T(n,m) is the number of difunctional (regular) binary relations between an n-element set and an m-element set.at n=51A265417
• Numbers k such that (11*10^k - 113) / 3 is prime.at n=27A280557
• Self-composition of the number of divisors function (A000005).at n=12A307305