Number of pairs of functions (f,g) on [n] such that fg is an idempotent.
A275025
Number of pairs of functions (f,g) on [n] such that fg is an idempotent.
Terms
- a(0) =1a(1) =1a(2) =14a(3) =411a(4) =21208a(5) =1703145a(6) =195285456a(7) =30113813863
External references
- oeis: A275025