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, -1, 1), (1, 1, 1)}.
A149569
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, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =63a(5) =201a(6) =991a(7) =3543a(8) =17521a(9) =66375a(10) =329361a(11) =1299919a(12) =6461629a(13) =26223915a(14) =130525411a(15) =541026087a(16) =2695329199a(17) =11354835089a(18) =56607090975a(19) =241583878837
External references
- oeis: A149569