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, 1), (-1, 1, 1), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
A148993
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, 1), (-1, 1, 1), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =116a(6) =457a(7) =1779a(8) =7298a(9) =29951a(10) =126547a(11) =536414a(12) =2314334a(13) =10024915a(14) =43931836a(15) =193265395a(16) =857130216a(17) =3814642513a(18) =17078057893a(19) =76692933568a(20) =345966606563
External references
- oeis: A148993