Number of ways to reciprocally link elements of an 3 X n array either to themselves or to exactly one horizontal, diagonal and antidiagonal neighbor.

A220622

Number of ways to reciprocally link elements of an 3 X n array either to themselves or to exactly one horizontal, diagonal and antidiagonal neighbor.

Terms

    a(0) =1a(1) =22a(2) =125a(3) =1189a(4) =9176a(5) =76955a(6) =624227a(7) =5131406a(8) =41957895a(9) =343809419a(10) =2814822600a(11) =23053276257a(12) =188779537161

External references