Number of (n+3) X 9 0..2 matrices with each 4 X 4 subblock idempotent.

Terms

a(0) =5737a(1) =4129a(2) =4868a(3) =5371a(4) =5727a(5) =7090a(6) =9090a(7) =11457a(8) =14037a(9) =17836a(10) =23484a(11) =31351a(12) =41643a(13) =55578a(14) =74998a(15) =102125a(16) =139377a(17) =190396a(18) =260660a(19) =357879a(20) =492171a(21) =677302a(22) =932510a(23) =1284753a(24) =1771097a(25) =2442380a(26) =3368672a(27) =4647011a(28) =6411491a(29) =8847050