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, 0), (0, -1, 1), (0, 1, 0), (1, -1, -1)}.
A148031
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, 0), (0, -1, 1), (0, 1, 0), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =17a(6) =51a(7) =124a(8) =391a(9) =1078a(10) =3457a(11) =10222a(12) =33470a(13) =105976a(14) =352741a(15) =1152698a(16) =3894734a(17) =13186214a(18) =45455545a(19) =156630035a(20) =545896294a(21) =1916833851a(22) =6797318020a(23) =24192288369a(24) =86537326784a(25) =311338858949
External references
- oeis: A148031