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), (0, 1, 1), (1, -1, 1)}.
A148859
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), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =96a(6) =349a(7) =1294a(8) =4900a(9) =19175a(10) =75820a(11) =304450a(12) =1237879a(13) =5080610a(14) =21057345a(15) =87889165a(16) =369769072a(17) =1565029070a(18) =6660413594a(19) =28504725054a(20) =122534388266a(21) =529047867652
External references
- oeis: A148859