Number of idempotent 3 X 3 -n..n matrices.

Terms

a(0) =164a(1) =848a(2) =1928a(3) =3752a(4) =5624a(5) =9920a(6) =12632a(7) =17084a(8) =21656a(9) =28952a(10) =33248a(11) =44072a(12) =49280a(13) =59480a(14) =70712a(15) =81392a(16) =88112a(17) =105416a(18) =113072a(19) =131312a(20) =147248a(21) =163592a(22) =172688a(23) =198824a(24) =212744a(25) =231944a(26) =249272a(27) =275192a(28) =286928a(29) =329528