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, 0), (-1, 0, -1), (0, 0, 1), (1, -1, 0), (1, 1, 0)}.
A150138
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, 0), (-1, 0, -1), (0, 0, 1), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =73a(5) =271a(6) =1080a(7) =4279a(8) =17742a(9) =73334a(10) =311463a(11) =1320901a(12) =5714076a(13) =24652208a(14) =108136214a(15) =472772076a(16) =2095411822a(17) =9259635607a(18) =41376583416a(19) =184401748204a(20) =829589409023
External references
- oeis: A150138