Number of nX4 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 0 vertically.

A207238

Number of nX4 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 0 vertically.

Terms

    a(0) =9a(1) =81a(2) =283a(3) =987a(4) =3866a(5) =13494a(6) =44730a(7) =150608a(8) =498551a(9) =1615388a(10) =5213924a(11) =16743300a(12) =53330410a(13) =169085209a(14) =534330613a(15) =1682097877a(16) =5278749205a(17) =16525845242a(18) =51617974464a(19) =160893899363a(20) =500630178086

External references