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, 1, 0), (0, 1, -1), (0, 1, 1), (1, -1, 1)}.
A148912
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, 1, 0), (0, 1, -1), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =32a(5) =110a(6) =435a(7) =1658a(8) =6916a(9) =27677a(10) =118612a(11) =490038a(12) =2142629a(13) =9072025a(14) =40134188a(15) =173149054a(16) =773430230a(17) =3382683098a(18) =15231187381a(19) =67328477351a(20) =305106582468
External references
- oeis: A148912