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, 0), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
A148663
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, 0), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =25a(5) =69a(6) =306a(7) =968a(8) =4495a(9) =15457a(10) =73187a(11) =265886a(12) =1276200a(13) =4822808a(14) =23356328a(15) =90916036a(16) =443070045a(17) =1764876843a(18) =8640616651a(19) =35059209106a(20) =172241437579a(21) =709515169465
External references
- oeis: A148663