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, 1, 1), (0, 0, -1), (0, 1, 0), (1, 0, 0)}.
A149975
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, 1, 1), (0, 0, -1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =56a(5) =205a(6) =782a(7) =3087a(8) =12476a(9) =51334a(10) =214466a(11) =907747a(12) =3883324a(13) =16763121a(14) =72929623a(15) =319477994a(16) =1407947296a(17) =6237863865a(18) =27767667839a(19) =124133911734a(20) =557062608329
External references
- oeis: A149975