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, 0, 1), (0, 1, 1), (1, -1, 1), (1, 1, -1)}.
A149055
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, 0, 1), (0, 1, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =40a(5) =155a(6) =661a(7) =2809a(8) =12388a(9) =55098a(10) =249064a(11) =1135248a(12) =5225124a(13) =24208799a(14) =112873953a(15) =528935624a(16) =2489987847a(17) =11767157943a(18) =55803419262a(19) =265442664895
External references
- oeis: A149055