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, 0), (0, 1, -1), (1, -1, 1), (1, 1, 1)}.
A149715
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, 0), (0, 1, -1), (1, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =71a(5) =297a(6) =1299a(7) =5699a(8) =25707a(9) =116793a(10) =536131a(11) =2480397a(12) =11559489a(13) =54122031a(14) =254694451a(15) =1203531177a(16) =5706949229a(17) =27145042957a(18) =129487009863a(19) =619188068719
External references
- oeis: A149715