Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (1, -1, 0), (1, 1, 1)}.
A149121
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =34a(5) =94a(6) =368a(7) =1131a(8) =4398a(9) =14236a(10) =55984a(11) =188576a(12) =740000a(13) =2551442a(14) =10067316a(15) =35443271a(16) =139712062a(17) =498416468a(18) =1971107420a(19) =7122847862a(20) =28153558524a(21) =102603939062a(22) =406431688608
External references
- oeis: A149121