Number of n-step paths that can go {west, southeast, southwest, northwest} on a 240-degree wedge on the equilateral triangular lattice.
A129637
Number of n-step paths that can go {west, southeast, southwest, northwest} on a 240-degree wedge on the equilateral triangular lattice.
Terms
- a(0) =1a(1) =3a(2) =11a(3) =41a(4) =157a(5) =607a(6) =2367a(7) =9277a(8) =36505a(9) =144059a(10) =569779a(11) =2257521a(12) =8957109a(13) =35579351a(14) =141460391a(15) =562871557a(16) =2241129905a(17) =8928207987a(18) =35584894299a(19) =141886838329a(20) =565938926669
External references
- oeis: A129637