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, 1), (-1, 0, -1), (0, 1, 0), (1, 0, 0)}.
A149839
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, 1), (-1, 0, -1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =12a(4) =36a(5) =105a(6) =359a(7) =1206a(8) =4067a(9) =14822a(10) =52823a(11) =192009a(12) =724475a(13) =2688197a(14) =10212299a(15) =39371249a(16) =150595178a(17) =587964607a(18) =2302876044a(19) =9017714047a(20) =35830596795a(21) =142208608418a(22) =566950728006
External references
- oeis: A149839