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, -1, 1), (-1, 0, 0), (1, 0, 1), (1, 1, -1)}.
A148850
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, -1, 1), (-1, 0, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =91a(6) =339a(7) =1191a(8) =4673a(9) =17489a(10) =70829a(11) =275583a(12) =1140249a(13) =4555059a(14) =19176287a(15) =78180708a(16) =333655636a(17) =1382789189a(18) =5964790733a(19) =25047746365a(20) =108998800785a(21) =462656900979
External references
- oeis: A148850