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, -1, 0), (-1, 0, -1), (0, 0, 1), (1, 1, 0)}.
A149980
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, -1, 0), (-1, 0, -1), (0, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =55a(5) =190a(6) =699a(7) =2538a(8) =9573a(9) =36694a(10) =140881a(11) =552275a(12) =2175779a(13) =8624406a(14) =34558783a(15) =138884061a(16) =561597871a(17) =2284073680a(18) =9315683597a(19) =38180167051a(20) =157023821303a(21) =647586013452
External references
- oeis: A149980