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, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
A148206
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, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =35a(6) =123a(7) =421a(8) =1576a(9) =5891a(10) =23087a(11) =91259a(12) =370459a(13) =1519776a(14) =6337233a(15) =26681825a(16) =113581304a(17) =487443036a(18) =2108776238a(19) =9183762845a(20) =40244481167a(21) =177314468256a(22) =785126740297
External references
- oeis: A148206