T(n,k)=Number of (n+2)X(k+2) 0..2 matrices with each 3X3 subblock idempotent.

Terms

a(0) =122a(1) =178a(2) =178a(3) =297a(4) =272a(5) =297a(6) =416a(7) =371a(8) =371a(9) =416a(10) =628a(11) =449a(12) =482a(13) =449a(14) =628a(15) =1045a(16) =630a(17) =571a(18) =571a(19) =630a(20) =1045a(21) =1694a(22) =894a(23) =782a(24) =666a(25) =782a(26) =894a(27) =1694a(28) =2668a(29) =1221