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, 0, -1), (1, 0, -1), (1, 1, 1)}.
A149659
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, 0, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =59a(5) =239a(6) =995a(7) =3967a(8) =16765a(9) =72109a(10) =309069a(11) =1335741a(12) =5867669a(13) =25895073a(14) =114438661a(15) =509003953a(16) =2281926919a(17) =10241361527a(18) =46062876287a(19) =208403698167a(20) =945304439507
External references
- oeis: A149659