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, -1), (-1, 0, 0), (1, -1, 1), (1, 1, -1), (1, 1, 1)}.
A149630
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, -1), (-1, 0, 0), (1, -1, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =67a(5) =265a(6) =1181a(7) =5035a(8) =22891a(9) =101385a(10) =467833a(11) =2124239a(12) =9908627a(13) =45726667a(14) =215107819a(15) =1004102949a(16) =4755098001a(17) =22389176879a(18) =106594259895a(19) =505286078225
External references
- oeis: A149630