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), (1, 1, -1)}.
A148877
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), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =30a(5) =93a(6) =359a(7) =1209a(8) =4730a(9) =16655a(10) =65691a(11) =237665a(12) =941630a(13) =3468116a(14) =13778724a(15) =51387436a(16) =204534160a(17) =769868698a(18) =3068092161a(19) =11630032273a(20) =46389072310a(21) =176824017758a(22) =705754225977
External references
- oeis: A148877