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, 1), (-1, 1, -1), (1, -1, 0), (1, 1, 1)}.
A149560
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, 1), (-1, 1, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =59a(5) =193a(6) =901a(7) =3271a(8) =15491a(9) =59357a(10) =283649a(11) =1126583a(12) =5423549a(13) =22084073a(14) =106895167a(15) =443477691a(16) =2155148575a(17) =9072490125a(18) =44228408951a(19) =188384093539a(20) =920685526563
External references
- oeis: A149560