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, 0, 1), (1, 0, -1), (1, 1, -1), (1, 1, 1)}.
A149730
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, 0, 1), (1, 0, -1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =75a(5) =295a(6) =1349a(7) =5729a(8) =26757a(9) =118527a(10) =560259a(11) =2546099a(12) =12144117a(13) =56151281a(14) =269644087a(15) =1262417629a(16) =6093239571a(17) =28796251075a(18) =139545443435a(19) =664306612693
External references
- oeis: A149730