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, 0), (-1, 1, 1), (1, -1, 1), (1, 0, 0), (1, 1, -1)}.
A148750
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, 0), (-1, 1, 1), (1, -1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =27a(5) =91a(6) =401a(7) =1601a(8) =7423a(9) =32011a(10) =151937a(11) =683445a(12) =3289407a(13) =15195887a(14) =73826601a(15) =347300701a(16) =1698509579a(17) =8094184535a(18) =39775700609a(19) =191355999417a(20) =943683591813
External references
- oeis: A148750