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, 0, 0)}.
A149997
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, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =59a(5) =214a(6) =823a(7) =3214a(8) =12749a(9) =51824a(10) =213137a(11) =886409a(12) =3730703a(13) =15807766a(14) =67446457a(15) =289940695a(16) =1253403583a(17) =5447204342a(18) =23787645787a(19) =104271410457a(20) =458794416353
External references
- oeis: A149997