T(n,k) = Number of (n+6) X (k+6) 0..2 matrices with each 7 X 7 subblock idempotent.

Terms

a(0) =145121216a(1) =10906923a(2) =10906923a(3) =6162817a(4) =1268962a(5) =6162817a(6) =4750292a(7) =1477939a(8) =1477939a(9) =4750292a(10) =4617228a(11) =1642077a(12) =1800748a(13) =1642077a(14) =4617228a(15) =4971859a(16) =1727928a(17) =1978918a(18) =1978918a(19) =1727928a(20) =4971859a(21) =5047936a(22) =1767017a(23) =2061018a(24) =2157776a(25) =2061018