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, 0), (-1, 0, 1), (0, -1, 1), (0, 0, -1), (1, 1, 1)}.
A149761
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, 0), (-1, 0, 1), (0, -1, 1), (0, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =19a(4) =71a(5) =289a(6) =1223a(7) =5203a(8) =22415a(9) =97869a(10) =431155a(11) =1911777a(12) =8534569a(13) =38305925a(14) =172641851a(15) =781231793a(16) =3548304153a(17) =16165900741a(18) =73854023197a(19) =338260967667
External references
- oeis: A149761