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, 0, 0), (-1, 1, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
A148210
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, 0, 0), (-1, 1, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =36a(6) =121a(7) =418a(8) =1518a(9) =5680a(10) =21838a(11) =85728a(12) =342817a(13) =1391551a(14) =5723767a(15) =23807834a(16) =100015361a(17) =423803675a(18) =1809693470a(19) =7780676837a(20) =33658840612a(21) =146415125415a(22) =640107365528
External references
- oeis: A148210