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), (1, 0, 1), (1, 1, -1)}.
A150021
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), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =18a(4) =67a(5) =255a(6) =1051a(7) =4369a(8) =18572a(9) =80952a(10) =354452a(11) =1578206a(12) =7087756a(13) =32022176a(14) =146097555a(15) =669267386a(16) =3084216216a(17) =14286647804a(18) =66396900479a(19) =309990281251
External references
- oeis: A150021