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, 0, 0), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
A148830
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, 0, 0), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =88a(6) =304a(7) =1071a(8) =3835a(9) =13958a(10) =51318a(11) =190490a(12) =712527a(13) =2681295a(14) =10147864a(15) =38572205a(16) =147212355a(17) =563800520a(18) =2165567037a(19) =8340972829a(20) =32201534803a(21) =124579280834a(22) =482897410606
External references
- oeis: A148830