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, 1), (-1, 0, 0), (0, 0, -1), (0, 1, 1), (1, -1, -1)}.
A148600
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, 1), (-1, 0, 0), (0, 0, -1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =58a(6) =187a(7) =620a(8) =2155a(9) =7503a(10) =27343a(11) =99504a(12) =369940a(13) =1398864a(14) =5324814a(15) =20451471a(16) =79699793a(17) =311650706a(18) =1228159752a(19) =4885776775a(20) =19499089825a(21) =78265361945a(22) =316448527578
External references
- oeis: A148600