Number of (n+6)X8 0..2 matrices with each 7X7 subblock idempotent.

Terms

a(0) =10906923a(1) =1268962a(2) =1477939a(3) =1642077a(4) =1727928a(5) =1767017a(6) =1778834a(7) =1780319a(8) =2325778a(9) =3228402a(10) =4296196a(11) =5442583a(12) =6641962a(13) =7853412a(14) =9058338a(15) =10803639a(16) =13455199a(17) =17176864a(18) =22043261a(19) =28095893a(20) =35365711a(21) =43848040