Number of (n+3) X 9 0..1 matrices with each 4 X 4 subblock idempotent.

Terms

a(0) =1345a(1) =775a(2) =929a(3) =1091a(4) =1233a(5) =1550a(6) =1997a(7) =2558a(8) =3206a(9) =4115a(10) =5408a(11) =7202a(12) =9577a(13) =12793a(14) =17227a(15) =23383a(16) =31835a(17) =43423a(18) =59358a(19) =81365a(20) =111733a(21) =153597a(22) =211297a(23) =290908a(24) =400784a(25) =552420a(26) =761645a(27) =1050373a(28) =1448862a(29) =1998871