Number of (n+2)X5 0..2 matrices with each 3X3 subblock idempotent.

Terms

a(0) =297a(1) =371a(2) =482a(3) =571a(4) =782a(5) =1086a(6) =1455a(7) =2010a(8) =2843a(9) =4018a(10) =5720a(11) =8226a(12) =11877a(13) =17199a(14) =24995a(15) =36409a(16) =53111a(17) =77574a(18) =113415a(19) =165921a(20) =242852a(21) =355585a(22) =520784a(23) =762873a(24) =1117653a(25) =1637589a(26) =2399570a(27) =3516286a(28) =5152892a(29) =7551432