Number of (n+3) X 6 0..1 matrices with each 4 X 4 subblock idempotent.

Terms

a(0) =512a(1) =428a(2) =514a(3) =629a(4) =728a(5) =929a(6) =1232a(7) =1627a(8) =2095a(9) =2739a(10) =3658a(11) =4945a(12) =6670a(13) =9010a(14) =12237a(15) =16720a(16) =22894a(17) =31375a(18) =43047a(19) =59167a(20) =81423a(21) =112123a(22) =154455a(23) =212868a(24) =293495a(25) =404781a(26) =558355a(27) =770299a(28) =1062824a(29) =1466590