Triangular array read by rows: T(n,k) is the number of n X n idempotent matrices over GF(3) having rank k, n>=0, 0<=k<=n.
A378666
Triangular array read by rows: T(n,k) is the number of n X n idempotent matrices over GF(3) having rank k, n>=0, 0<=k<=n.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =12a(5) =1a(6) =1a(7) =117a(8) =117a(9) =1a(10) =1a(11) =1080a(12) =10530a(13) =1080a(14) =1a(15) =1a(16) =9801a(17) =882090a(18) =882090a(19) =9801a(20) =1a(21) =1a(22) =88452a(23) =72243171a(24) =666860040a(25) =72243171a(26) =88452a(27) =1a(28) =1a(29) =796797
External references
- oeis: A378666