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, 1), (-1, 0, 1), (0, 0, 1), (1, 0, -1), (1, 1, 1)}.
A150813
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, 1), (-1, 0, 1), (0, 0, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =31a(4) =135a(5) =585a(6) =2649a(7) =12019a(8) =55654a(9) =258542a(10) =1214385a(11) =5721966a(12) =27142088a(13) =129101750a(14) =616801930a(15) =2953712052a(16) =14188995038a(17) =68294147421a(18) =329480324924
External references
- oeis: A150813