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, 0, -1), (-1, 1, 1), (1, -1, 0), (1, 0, 0)}.
A148269
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, 0, -1), (-1, 1, 1), (1, -1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =15a(5) =39a(6) =145a(7) =410a(8) =1627a(9) =5051a(10) =20773a(11) =67294a(12) =280888a(13) =946637a(14) =4036143a(15) =13997094a(16) =60219891a(17) =213448298a(18) =928630979a(19) =3355497888a(20) =14704973740a(21) =53923588306a(22) =237854323996a(23) =883911540080
External references
- oeis: A148269