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, 0), (0, 0, 1), (1, 1, -1)}.
A148473
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, 0), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =65a(6) =226a(7) =838a(8) =3201a(9) =12386a(10) =48948a(11) =197608a(12) =809096a(13) =3345155a(14) =13980334a(15) =59041103a(16) =251334992a(17) =1076995274a(18) =4645807488a(19) =20164588874a(20) =87973297367a(21) =385580488738
External references
- oeis: A148473