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, 0), (0, 1, 1), (1, -1, 0), (1, 1, -1)}.
A149043
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, 0), (0, 1, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =37a(5) =134a(6) =536a(7) =2162a(8) =9124a(9) =38480a(10) =165534a(11) =723098a(12) =3193196a(13) =14221802a(14) =63772316a(15) =287880505a(16) =1309694973a(17) =5985175167a(18) =27484724851a(19) =126726210253a(20) =586613118924
External references
- oeis: A149043