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, 0), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149661
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, 0), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =59a(5) =239a(6) =995a(7) =3999a(8) =16797a(9) =72461a(10) =311341a(11) =1341853a(12) =5899125a(13) =26060865a(14) =115032997a(15) =511837889a(16) =2294771479a(17) =10295473175a(18) =46310998767a(19) =209480589415a(20) =950055719843
External references
- oeis: A149661