Number of ways to reciprocally link elements of an 5 X n array either to themselves or to exactly two horizontal and antidiagonal neighbors, without consecutive collinear links.
A220710
Number of ways to reciprocally link elements of an 5 X n array either to themselves or to exactly two horizontal and antidiagonal neighbors, without consecutive collinear links.
Terms
- a(0) =1a(1) =1a(2) =8a(3) =28a(4) =107a(5) =405a(6) =1520a(7) =5706a(8) =21418a(9) =80390a(10) =301736a(11) =1132543a(12) =4250895a(13) =15955408a(14) =59887275a(15) =224782132a(16) =843701335a(17) =3166765105a(18) =11886195940a(19) =44613876758a(20) =167454575870a(21) =628527215306
External references
- oeis: A220710