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), (0, 1, -1), (1, -1, 1), (1, 0, 1)}.
A148805
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), (0, 1, -1), (1, -1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =83a(6) =289a(7) =999a(8) =3600a(9) =12955a(10) =47849a(11) =176552a(12) =661939a(13) =2482659a(14) =9412263a(15) =35707725a(16) =136454697a(17) =521967439a(18) =2007069109a(19) =7725358220a(20) =29848113425a(21) =115440484663a(22) =447751809956
External references
- oeis: A148805