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, 1, 0), (1, -1, 1), (1, 0, -1)}.
A148400
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, 1, 0), (1, -1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =54a(6) =197a(7) =746a(8) =2876a(9) =11390a(10) =45977a(11) =188066a(12) =780848a(13) =3280312a(14) =13909971a(15) =59533135a(16) =256759223a(17) =1114687983a(18) =4869337791a(19) =21385124366a(20) =94368601473a(21) =418274225010
External references
- oeis: A148400