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, 0, 1), (0, 0, -1), (1, -1, 0), (1, 1, 0)}.
A149198
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, 0, 1), (0, 0, -1), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =38a(5) =127a(6) =498a(7) =1863a(8) =7543a(9) =29856a(10) =124254a(11) =509212a(12) =2164118a(13) =9089475a(14) =39239286a(15) =167827362a(16) =733433910a(17) =3180579412a(18) =14038447686a(19) =61547774679a(20) =273888893696
External references
- oeis: A149198