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), (-1, 0, 1), (0, 1, 0), (1, -1, 0)}.
A148121
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), (-1, 0, 1), (0, 1, 0), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =26a(6) =70a(7) =211a(8) =637a(9) =1898a(10) =5975a(11) =19499a(12) =62042a(13) =199992a(14) =673153a(15) =2273986a(16) =7603164a(17) =25960343a(18) =90166835a(19) =310587571a(20) =1071398522a(21) =3766507591a(22) =13307211972a(23) =46786797955a(24) =165853350155a(25) =593866808974
External references
- oeis: A148121