Number of polygons of length 4n on Manhattan lattice.
A006781
Number of polygons of length 4n on Manhattan lattice.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =32a(4) =168a(5) =970a(6) =5984a(7) =38786a(8) =261160a(9) =1812630a(10) =12895360a(11) =93638634a(12) =691793872a(13) =5186869122a(14) =39388514522a(15) =302457399674
External references
- oeis: A006781