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), (-1, 1, -1), (0, 1, 0), (1, 0, 0)}.
A149922
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), (-1, 1, -1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =47a(5) =158a(6) =551a(7) =1978a(8) =7280a(9) =27287a(10) =103890a(11) =400726a(12) =1562935a(13) =6152911a(14) =24424119a(15) =97651753a(16) =392890089a(17) =1589751091a(18) =6465135718a(19) =26411296607a(20) =108341410515a(21) =446089923524
External references
- oeis: A149922