Number of 6 X 6 0..n matrices with each 2 X 2 subblock idempotent.

Terms

a(0) =428a(1) =542a(2) =668a(3) =806a(4) =956a(5) =1118a(6) =1292a(7) =1478a(8) =1676a(9) =1886a(10) =2108a(11) =2342a(12) =2588a(13) =2846a(14) =3116a(15) =3398a(16) =3692a(17) =3998a(18) =4316a(19) =4646a(20) =4988a(21) =5342a(22) =5708a(23) =6086a(24) =6476a(25) =6878a(26) =7292a(27) =7718a(28) =8156a(29) =8606