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, 0), (1, 1, 1)}.
A149536
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, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =49a(5) =177a(6) =667a(7) =2543a(8) =10041a(9) =39539a(10) =158109a(11) =639433a(12) =2601015a(13) =10639159a(14) =43850367a(15) =181446123a(16) =753443505a(17) =3143865503a(18) =13160935401a(19) =55241186593a(20) =232610710411a(21) =981971030779
External references
- oeis: A149536