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, 1, -1), (1, -1, 1), (1, 1, 0)}.
A149216
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, 1, -1), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =42a(5) =136a(6) =594a(7) =2142a(8) =9669a(9) =36983a(10) =170702a(11) =678033a(12) =3178156a(13) =12960483a(14) =61428141a(15) =255417323a(16) =1220640672a(17) =5151889022a(18) =24776988418a(19) =105826225847a(20) =511470203676
External references
- oeis: A149216