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, 1, 1), (1, 0, -1)}.
A148977
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, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =32a(5) =109a(6) =419a(7) =1588a(8) =6394a(9) =25551a(10) =106210a(11) =438283a(12) =1863689a(13) =7875060a(14) =34040384a(15) =146360355a(16) =640715615a(17) =2791465710a(18) =12343656221a(19) =54346670390a(20) =242277534379
External references
- oeis: A148977