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, 0, 0), (0, -1, -1), (1, 1, 1)}.
A149507
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, 0, 0), (0, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =11a(4) =47a(5) =155a(6) =567a(7) =2221a(8) =8173a(9) =32497a(10) =128021a(11) =500621a(12) =2045881a(13) =8159033a(14) =33233365a(15) =136610895a(16) =556058415a(17) =2309390411a(18) =9545735783a(19) =39570216519a(20) =165775628203a(21) =690570644667
External references
- oeis: A149507