Number of nX2 0..1 arrays with no 1 equal to more than two of its king-move neighbors, with the exception of exactly two elements.

A282587

Number of nX2 0..1 arrays with no 1 equal to more than two of its king-move neighbors, with the exception of exactly two elements.

Terms

    a(0) =0a(1) =0a(2) =4a(3) =12a(4) =52a(5) =220a(6) =916a(7) =3700a(8) =14752a(9) =58156a(10) =225304a(11) =862968a(12) =3270532a(13) =12271368a(14) =45656044a(15) =168573708a(16) =618154444a(17) =2252870436a(18) =8165066740a(19) =29443594572a(20) =105688111208a(21) =377777628972

External references