Number of 3Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 0 vertically.

A207243

Number of 3Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 0 vertically.

Terms

    a(0) =6a(1) =36a(2) =102a(3) =283a(4) =699a(5) =1526a(6) =3355a(7) =6888a(8) =13954a(9) =27816a(10) =54211a(11) =105147a(12) =201340a(13) =382799a(14) =723838a(15) =1359688a(16) =2544322a(17) =4740623a(18) =8801291a(19) =16292518a(20) =30071783a(21) =55371672a(22) =101727342a(23) =186506700a(24) =341316455a(25) =623552411a(26) =1137394900a(27) =2071676507

External references