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, 0), (0, 1, -1), (1, -1, 1), (1, 1, 0)}.
A149287
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, 0), (0, 1, -1), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =44a(5) =163a(6) =665a(7) =2746a(8) =11685a(9) =50560a(10) =222560a(11) =990647a(12) =4461545a(13) =20261605a(14) =92750052a(15) =427391693a(16) =1980932854a(17) =9228373502a(18) =43188083319a(19) =202928074526a(20) =956967526605
External references
- oeis: A149287