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, 0), (1, -1, -1), (1, 1, -1), (1, 1, 1)}.
A149601
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, 0), (1, -1, -1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =61a(5) =221a(6) =961a(7) =3843a(8) =16691a(9) =69321a(10) =309193a(11) =1326193a(12) =5933567a(13) =25855481a(14) =117273025a(15) =519449575a(16) =2361947235a(17) =10553854571a(18) =48388079905a(19) =218345888851
External references
- oeis: A149601