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, 0, 1), (-1, 1, 1), (0, -1, 1), (0, 1, 0), (1, 0, -1)}.
A148171
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, 0, 1), (-1, 1, 1), (0, -1, 1), (0, 1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =32a(6) =106a(7) =356a(8) =1276a(9) =4657a(10) =17645a(11) =68100a(12) =269090a(13) =1079751a(14) =4402729a(15) =18173798a(16) =75897938a(17) =320069369a(18) =1361833054a(19) =5839681294a(20) =25218300840a(21) =109593862795a(22) =479006422233
External references
- oeis: A148171