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, 0), (0, 0, -1), (1, 0, 1)}.
A148669
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, 0), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =19a(5) =60a(6) =185a(7) =571a(8) =1857a(9) =6100a(10) =20193a(11) =68372a(12) =233154a(13) =795296a(14) =2743437a(15) =9550939a(16) =33338093a(17) =116943668a(18) =412645815a(19) =1460122884a(20) =5181607406a(21) =18468520608a(22) =66016250037a(23) =236455799708a(24) =849337831838
External references
- oeis: A148669