T(n,k)=Number of idempotent n X n -k..k matrices of rank n-2.
A220473
T(n,k)=Number of idempotent n X n -k..k matrices of rank n-2.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =0a(4) =1a(5) =87a(6) =0a(7) =1a(8) =447a(9) =4470a(10) =0a(11) =1a(12) =999a(13) =90390a(14) =172850a(15) =0a(16) =1a(17) =1935a(18) =424374
External references
- oeis: A220473