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), (0, 1, 1), (1, -1, 0)}.
A148871
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), (0, 1, 1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =29a(5) =95a(6) =352a(7) =1317a(8) =5178a(9) =20231a(10) =81681a(11) =334624a(12) =1385975a(13) =5778504a(14) =24432650a(15) =104130924a(16) =445996034a(17) =1923136631a(18) =8353882501a(19) =36444183670a(20) =159607590184a(21) =702556782360
External references
- oeis: A148871