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, 1, 1), (1, 0, 1), (1, 1, -1)}.
A148867
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, 1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =29a(5) =90a(6) =338a(7) =1136a(8) =4364a(9) =15310a(10) =59572a(11) =214262a(12) =840471a(13) =3078526a(14) =12139887a(15) =45044594a(16) =178241996a(17) =667774177a(18) =2648963397a(19) =9999689992a(20) =39738357610a(21) =150915750913a(22) =600537722260
External references
- oeis: A148867