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, 1, 0)}.
A149854
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, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =37a(5) =111a(6) =346a(7) =1100a(8) =3557a(9) =11683a(10) =38926a(11) =131154a(12) =445765a(13) =1526305a(14) =5261985a(15) =18254431a(16) =63672445a(17) =223138635a(18) =785267758a(19) =2774187398a(20) =9835528373a(21) =34983477901a(22) =124795716145a(23) =446376963933
External references
- oeis: A149854