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), (1, 0, 0), (1, 0, 1), (1, 1, 0)}.
A151241
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), (1, 0, 0), (1, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =3a(2) =15a(3) =63a(4) =315a(5) =1431a(6) =7155a(7) =33615a(8) =168075a(9) =804087a(10) =4020435a(11) =19448991a(12) =97244955a(13) =473907591a(14) =2369537955a(15) =11607504687a(16) =58037523435a(17) =285383915415
External references
- oeis: A151241