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, 1), (1, 1, -1), (1, 1, 1)}.
A149281
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, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =44a(5) =138a(6) =552a(7) =1863a(8) =7452a(9) =26230a(10) =104920a(11) =379038a(12) =1516152a(13) =5573492a(14) =22293968a(15) =82976111a(16) =331904444a(17) =1246784478a(18) =4987137912a(19) =18868203514a(20) =75472814056a(21) =287167092908
External references
- oeis: A149281