Number of idempotent 6X6 0..n matrices of rank 5.

Terms

a(0) =378a(1) =2910a(2) =12282a(3) =37494a(4) =93306a(5) =201678a(6) =393210a(7) =708582a(8) =1199994a(9) =1932606a(10) =2985978a(11) =4455510a(12) =6453882a(13) =9112494a(14) =12582906a(15) =17038278a(16) =22674810a(17) =29713182a(18) =38399994a(19) =49009206a(20) =61843578a(21) =77236110a(22) =95551482a(23) =117187494a(24) =142576506a(25) =172186878