Number of ways to reciprocally link elements of an nX4 array either to themselves or to exactly one horizontal, diagonal and antidiagonal neighbor.

A220617

Number of ways to reciprocally link elements of an nX4 array either to themselves or to exactly one horizontal, diagonal and antidiagonal neighbor.

Terms

    a(0) =5a(1) =87a(2) =1189a(3) =17084a(4) =243119a(5) =3466455a(6) =49406943a(7) =704243629a(8) =10038098456a(9) =143080761421

External references