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), (0, 0, 1), (0, 1, 0), (1, -1, 0)}.
A149878
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), (0, 0, 1), (0, 1, 0), (1, -1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =42a(5) =140a(6) =480a(7) =1710a(8) =6227a(9) =23087a(10) =87495a(11) =335253a(12) =1304117a(13) =5120189a(14) =20286069a(15) =81087950a(16) =326175588a(17) =1321918434a(18) =5385669252a(19) =22062590893a(20) =90821095614a(21) =375419697147
External references
- oeis: A149878