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, 1), (0, 0, -1), (1, -1, 0), (1, 1, 1)}.
A149675
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, 1), (0, 0, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =65a(5) =261a(6) =1085a(7) =4571a(8) =19587a(9) =84885a(10) =371691a(11) =1640097a(12) =7286299a(13) =32554855a(14) =146180405a(15) =659196933a(16) =2984034309a(17) =13553661103a(18) =61747484695a(19) =282070090245
External references
- oeis: A149675