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

Terms

a(0) =452a(1) =370a(2) =512a(3) =739a(4) =990a(5) =1345a(6) =1852a(7) =2659a(8) =3846a(9) =5589a(10) =8064a(11) =11675a(12) =16954a(13) =24757a(14) =36196a(15) =52963a(16) =77458a(17) =113341a(18) =165916a(19) =243035a(20) =356062a(21) =521713a(22) =764408a(23) =1120079a(24) =1641326a(25) =2405317a(26) =3525004a(27) =5165987a(28) =7570886a(29) =11095421