Number of (n+6)X13 0..1 matrices with each 7X7 subblock idempotent.

Terms

a(0) =146715a(1) =28629a(2) =29066a(3) =31741a(4) =34107a(5) =35891a(6) =37202a(7) =38192a(8) =43958a(9) =54300a(10) =68099a(11) =84280a(12) =102048a(13) =120877a(14) =140440a(15) =165512a(16) =200668a(17) =249364a(18) =313981a(19) =396105a(20) =496796a(21) =616787a(22) =761586a(23) =941276a(24) =1169396a(25) =1461866a(26) =1836192a(27) =2310940a(28) =2905409a(29) =3644406