Number of 4Xn 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 0 vertically.

A207962

Number of 4Xn 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 0 vertically.

Terms

    a(0) =9a(1) =81a(2) =297a(3) =989a(4) =3080a(5) =9994a(6) =32358a(7) =104176a(8) =335940a(9) =1083914a(10) =3495930a(11) =11275444a(12) =36368274a(13) =117303034a(14) =378351488a(15) =1220339904a(16) =3936101206a(17) =12695569864a(18) =40948497182a(19) =132075911156a(20) =425999751988

External references