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, 0, -1), (0, 1, 1), (1, -1, 0), (1, 1, -1)}.
A148972
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, 0, -1), (0, 1, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =32a(5) =106a(6) =426a(7) =1630a(8) =6384a(9) =25946a(10) =108308a(11) =445189a(12) =1877503a(13) =8022260a(14) =34370984a(15) =148012675a(16) =643610626a(17) =2817324764a(18) =12368693445a(19) =54448245375a(20) =241561372630
External references
- oeis: A148972