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, 0), (0, 1, 0), (1, -1, -1), (1, -1, 1)}.
A148247
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, 0), (0, 1, 0), (1, -1, -1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =36a(6) =120a(7) =389a(8) =1333a(9) =4544a(10) =16359a(11) =59002a(12) =215082a(13) =798359a(14) =3015941a(15) =11408878a(16) =43503397a(17) =167952084a(18) =652211220a(19) =2542787190a(20) =9987901113a(21) =39451669571a(22) =156290211436a(23) =622328685876
External references
- oeis: A148247