Number of idempotent 6 X 6 0..n matrices of rank 4.

A224120

Number of idempotent 6 X 6 0..n matrices of rank 4.

Terms

    a(0) =12405a(1) =260235a(2) =2273505a(3) =12775065a(4) =52968495a(5) =178881705a(6) =514370175a(7) =1311704565a(8) =3033506835a(9) =6484756785

External references