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, 0), (-1, 0, -1), (0, 0, 1), (1, 0, -1), (1, 1, 0)}.
A150132
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, 0), (-1, 0, -1), (0, 0, 1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =72a(5) =267a(6) =1049a(7) =4143a(8) =16949a(9) =69663a(10) =292819a(11) =1233912a(12) =5290492a(13) =22699211a(14) =98729286a(15) =429510950a(16) =1888906238a(17) =8306249099a(18) =36856032199a(19) =163474875090a(20) =730652199324
External references
- oeis: A150132