Number of (n+3) X 7 0..1 matrices with each 4 X 4 subblock idempotent.

Terms

a(0) =739a(1) =517a(2) =629a(3) =752a(4) =861a(5) =1091a(6) =1433a(7) =1871a(8) =2390a(9) =3108a(10) =4136a(11) =5571a(12) =7493a(13) =10098a(14) =13695a(15) =18692a(16) =25575a(17) =35024a(18) =48030a(19) =65994a(20) =90801a(21) =125014a(22) =172189a(23) =237285a(24) =327144a(25) =451169a(26) =622321a(27) =858522a(28) =1184534a(29) =1634520