Number of (n+6)X9 0..1 matrices with each 7X7 subblock idempotent.

Terms

a(0) =125525a(1) =22928a(2) =21966a(3) =24293a(4) =26294a(5) =27945a(6) =29066a(7) =30031a(8) =35282a(9) =44719a(10) =57279a(11) =72507a(12) =89253a(13) =106861a(14) =125137a(15) =148577a(16) =181148a(17) =226344a(18) =286350a(19) =362933a(20) =456996a(21) =569113a(22) =704154a(23) =871995a(24) =1084810a(25) =1357286a(26) =1706012a(27) =2148697a(28) =2703197a(29) =3392851