Number of idempotent binary relation matrices E on [n] such that E contains an identity matrix of order n-1 and (E - I_n)^2 = 0.

A360743

Number of idempotent binary relation matrices E on [n] such that E contains an identity matrix of order n-1 and (E - I_n)^2 = 0.

Terms

    a(0) =1a(1) =2a(2) =9a(3) =52a(4) =435a(5) =5046a(6) =81501a(7) =1823144a(8) =56572263a(9) =2435930410a(10) =145888123953

External references