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, 1)}.
A149671
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, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =63a(5) =259a(6) =1067a(7) =4457a(8) =19191a(9) =82841a(10) =362233a(11) =1598323a(12) =7088617a(13) =31667685a(14) =142110015a(15) =640483695a(16) =2899395681a(17) =13163953953a(18) =59965256157a(19) =273940539817
External references
- oeis: A149671