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, 0, 1), (1, 0, 0), (1, 1, -1)}.
A148615
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, 0, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =21a(5) =55a(6) =216a(7) =659a(8) =2773a(9) =9274a(10) =40660a(11) =144482a(12) =650821a(13) =2415406a(14) =11092583a(15) =42543680a(16) =198221801a(17) =780032966a(18) =3674928118a(19) =14762312411a(20) =70157373141a(21) =286612381208
External references
- oeis: A148615