Number of (n+3) X 5 0..2 matrices with each 4 X 4 subblock idempotent.

Terms

a(0) =1623a(1) =1920a(2) =2493a(3) =2863a(4) =3123a(5) =4129a(6) =5711a(7) =7604a(8) =9713a(9) =12764a(10) =17344a(11) =23754a(12) =32224a(13) =43673a(14) =59650a(15) =81969a(16) =112701a(17) =154811a(18) =212841a(19) =293114a(20) =404063a(21) =557046a(22) =767994a(23) =1059140a(24) =1461174a(25) =2016107a(26) =2781924a(27) =3838807a(28) =5297655a(29) =7311353