Number of (n+1) X 5 0..1 matrices with each 2 X 2 subblock idempotent.

Terms

a(0) =48a(1) =86a(2) =125a(3) =196a(4) =294a(5) =448a(6) =682a(7) =1049a(8) =1626a(9) =2543a(10) =4007a(11) =6355a(12) =10131a(13) =16216a(14) =26035a(15) =41894a(16) =67524a(17) =108962a(18) =175976a(19) =284371a(20) =459720a(21) =743401a(22) =1202365a(23) =1944941a(24) =3146409a(25) =5090378a(26) =8235737a(27) =13324984a(28) =21559506a(29) =34883188