Number of nX3 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops or left turns.
A221887
Number of nX3 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops or left turns.
Terms
- a(0) =0a(1) =8a(2) =0a(3) =90a(4) =204a(5) =1297a(6) =4608a(7) =23159a(8) =92312a(9) =425249a(10) =1799292a(11) =7982268a(12) =34469356a(13) =151243634a(14) =657198136a(15) =2872557590a(16) =12512098304a(17) =54609983231a(18) =238067509008
External references
- oeis: A221887