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), (0, 1, 0), (1, 1, -1)}.
A148200
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), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =34a(6) =115a(7) =376a(8) =1358a(9) =4870a(10) =18456a(11) =70179a(12) =275642a(13) =1090973a(14) =4405446a(15) =17944426a(16) =74077835a(17) =308315427a(18) =1295666596a(19) =5484134671a(20) =23384896325a(21) =100328710502a(22) =433002505994
External references
- oeis: A148200