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, 0, 1), (-1, 1, 0), (1, 0, 1), (1, 1, -1)}.
A149415
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, 0, 1), (-1, 1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =54a(5) =184a(6) =868a(7) =3270a(8) =15789a(9) =62535a(10) =305725a(11) =1250467a(12) =6158414a(13) =25763798a(14) =127467985a(15) =542192997a(16) =2690596202a(17) =11591354117a(18) =57638344104a(19) =250831973091
External references
- oeis: A149415