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, 0, 1), (-1, 1, 0), (0, -1, 1), (0, 1, -1), (1, 0, 0)}.
A148711
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, 0, 1), (-1, 1, 0), (0, -1, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =75a(6) =267a(7) =985a(8) =3757a(9) =14741a(10) =59037a(11) =240969a(12) =998175a(13) =4189717a(14) =17780797a(15) =76195667a(16) =329283701a(17) =1433632569a(18) =6283001549a(19) =27697690653a(20) =122745242869a(21) =546537971273
External references
- oeis: A148711