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, -1), (1, 1, 1)}.
A149500
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, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =9a(4) =45a(5) =121a(6) =509a(7) =1745a(8) =6565a(9) =25473a(10) =95333a(11) =377369a(12) =1466925a(13) =5767385a(14) =23131709a(15) =91583241a(16) =369636245a(17) =1489745457a(18) =6019414749a(19) =24561243097a(20) =99915769557a(21) =409006211521
External references
- oeis: A149500