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)}.
A149259
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)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =40a(5) =118a(6) =456a(7) =1507a(8) =5744a(9) =19426a(10) =75560a(11) =266158a(12) =1030352a(13) =3670444a(14) =14352464a(15) =52199971a(16) =203654240a(17) =745615306a(18) =2926444392a(19) =10849522426a(20) =42528251536a(21) =158358462868a(22) =623214599920
External references
- oeis: A149259