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), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
A148589
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), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =55a(6) =196a(7) =639a(8) =2327a(9) =8256a(10) =30927a(11) =115956a(12) =447505a(13) =1732101a(14) =6831117a(15) =27059859a(16) =108748569a(17) =439260818a(18) =1790252423a(19) =7336642698a(20) =30255128337a(21) =125497752360a(22) =523152712624
External references
- oeis: A148589