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), (0, 1, 0), (1, 0, 0)}.
A149956
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), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =52a(5) =179a(6) =657a(7) =2445a(8) =9340a(9) =36701a(10) =145628a(11) =586312a(12) =2398468a(13) =9879421a(14) =41072067a(15) =172514552a(16) =728279781a(17) =3094286178a(18) =13241783880a(19) =56885626708a(20) =245535890251
External references
- oeis: A149956