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, 0, 1), (0, -1, 1), (1, 1, -1), (1, 1, 1)}.
A149447
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, 0, 1), (0, -1, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =48a(5) =178a(6) =680a(7) =2575a(8) =10068a(9) =38974a(10) =152724a(11) =599410a(12) =2363912a(13) =9311216a(14) =36905368a(15) =146022913a(16) =579379360a(17) =2300418218a(18) =9145258964a(19) =36352638418a(20) =144764733828a(21) =576290038860
External references
- oeis: A149447