Number of nX7 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

A281562

Number of nX7 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

Terms

    a(0) =0a(1) =2180a(2) =16656a(3) =67834a(4) =243040a(5) =692421a(6) =1818257a(7) =4578736a(8) =11105124a(9) =26461889a(10) =62339543a(11) =144976485a(12) =333721541a(13) =763157635a(14) =1734158357a(15) =3916675838a(16) =8803744638a(17) =19704291923a(18) =43922013234a(19) =97556616406a(20) =215997549807a(21) =476806559336

External references