Number of idempotent 5X5 0..n matrices.

Terms

a(0) =5682a(1) =54182a(2) =248442a(3) =855192a(4) =2319872a(5) =5617912a(6) =11946912a(7) =23683432a(8) =43615442a(9) =76232022a(10) =126661082a(11) =203564942a(12) =314635222a(13) =473400002a(14) =693921022