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, 1, 1), (1, -1, -1), (1, 0, 1)}.
A150150
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, 1, 1), (1, -1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =74a(5) =274a(6) =1103a(7) =4366a(8) =18185a(9) =75130a(10) =320070a(11) =1357859a(12) =5878960a(13) =25424127a(14) =111353321a(15) =488593653a(16) =2159883504a(17) =9580510260a(18) =42685811494a(19) =190927066056a(20) =856389848702
External references
- oeis: A150150