Number of (n+4)X(n+4) 0..2 matrices with each 5X5 subblock idempotent.

Terms

a(0) =54182a(1) =15354a(2) =24024a(3) =29254a(4) =32204a(5) =34032a(6) =50748a(7) =77986a(8) =111302a(9) =148228a(10) =187624a(11) =246190a(12) =335440a(13) =462208a(14) =630792a(15) =844338a(16) =1124602a(17) =1505884a(18) =2030116a(19) =2744262a(20) =3699158a(21) =4970136a(22) =6670642a(23) =8960714a(24) =12052800a(25) =16216412a(26) =21805522a(27) =29300694