Number of (n+1) X (4+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant-stress 1 X 1 tilings).

A235285

Number of (n+1) X (4+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant-stress 1 X 1 tilings).

Terms

    a(0) =136a(1) =188a(2) =248a(3) =380a(4) =544a(5) =908a(6) =1400a(7) =2492a(8) =4096a(9) =7628a(10) =13208a(11) =25340a(12) =45664a(13) =89228a(14) =165560a(15) =326972a(16) =619456a(17) =1230668a(18) =2366168a(19) =4715900a(20) =9162784a(21) =18292748a(22) =35811320a(23) =71557052a(24) =140857216a(25) =281583308a(26) =556527128a(27) =1112792060a(28) =2205927904a(29) =4411331468

External references