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, 0), (-1, 0, -1), (0, -1, 0), (0, 1, -1), (1, 1, 1)}.
A149591
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, 0), (-1, 0, -1), (0, -1, 0), (0, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =57a(5) =217a(6) =881a(7) =3531a(8) =14669a(9) =61597a(10) =262017a(11) =1119747a(12) =4841949a(13) =21082509a(14) =92245027a(15) =405547121a(16) =1793600501a(17) =7962983781a(18) =35463175171a(19) =158509162139a(20) =710946989375
External references
- oeis: A149591