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, -1), (1, 0, -1), (1, 0, 1)}.
A148520
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, -1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =17a(5) =40a(6) =127a(7) =353a(8) =1115a(9) =3414a(10) =10913a(11) =34172a(12) =113138a(13) =362986a(14) =1218153a(15) =3982101a(16) =13518023a(17) =45159834a(18) =154268431a(19) =519874828a(20) =1797432550a(21) =6119201254a(22) =21283455867a(23) =73013149074a(24) =255499876572a(25) =884948135634
External references
- oeis: A148520