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, 1), (0, 1, 0), (0, 1, 1), (1, 0, -1)}.
A149954
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, 1), (0, 1, 0), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =51a(5) =183a(6) =690a(7) =2682a(8) =10670a(9) =43382a(10) =179340a(11) =751275a(12) =3185546a(13) =13642912a(14) =58921366a(15) =256410415a(16) =1123212708a(17) =4948563894a(18) =21915734848a(19) =97510901672a(20) =435664551650
External references
- oeis: A149954