Number of (n+4)X(n+4) 0..1 matrices with each 5X5 subblock idempotent.

Terms

a(0) =5682a(1) =1312a(2) =1636a(3) =2166a(4) =2700a(5) =3158a(6) =4572a(7) =7006a(8) =10366a(9) =14544a(10) =19462a(11) =26588a(12) =37294a(13) =52826a(14) =74314a(15) =102814a(16) =141460a(17) =195148a(18) =270382a(19) =375154a(20) =518878a(21) =715182a(22) =984104a(23) =1354110a(24) =1863992a(25) =2564712a(26) =3524856a(27) =4838762a(28) =6637124a(29) =9099956