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), (0, 1, 1), (1, -1, 1)}.
A148838
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), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =90a(6) =319a(7) =1133a(8) =4177a(9) =15731a(10) =60161a(11) =232486a(12) =909334a(13) =3592694a(14) =14306499a(15) =57409297a(16) =232008875a(17) =943279457a(18) =3855594887a(19) =15837909951a(20) =65352873764a(21) =270788315046
External references
- oeis: A148838