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, 0, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
A148151
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, 0, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =30a(6) =93a(7) =294a(8) =969a(9) =3282a(10) =11329a(11) =39882a(12) =142295a(13) =513939a(14) =1875643a(15) =6902317a(16) =25594800a(17) =95509369a(18) =358392077a(19) =1351474090a(20) =5118071489a(21) =19456766201a(22) =74217281735a(23) =283958971978
External references
- oeis: A148151