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, -1, 1), (-1, 1, 0), (1, 0, -1), (1, 0, 1)}.
A148745
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, -1, 1), (-1, 1, 0), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =27a(5) =81a(6) =311a(7) =1021a(8) =4297a(9) =15419a(10) =64017a(11) =234823a(12) =1027493a(13) =3966913a(14) =17125911a(15) =66455693a(16) =297225631a(17) =1194038589a(18) =5276016417a(19) =21192497825a(20) =96118467609a(21) =396039404493
External references
- oeis: A148745