Number of n X 3 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 0 1 0 vertically.

A207769

Number of n X 3 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 0 1 0 vertically.

Terms

    a(0) =6a(1) =36a(2) =84a(3) =192a(4) =450a(5) =972a(6) =2040a(7) =4278a(8) =8910a(9) =18462a(10) =38214a(11) =79044a(12) =163386a(13) =337638a(14) =697668a(15) =1441488a(16) =2978208a(17) =6153084a(18) =12712374a(19) =26263824a(20) =54261060a(21) =112103226a(22) =231604842a(23) =478494570a(24) =988567506a(25) =2042375592a(26) =4219537710a(27) =8717543538

External references