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), (1, 0, -1), (1, 0, 1), (1, 1, -1)}.
A149381
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), (1, 0, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =48a(5) =176a(6) =750a(7) =3084a(8) =13699a(9) =58877a(10) =268518a(11) =1191090a(12) =5530613a(13) =25078402a(14) =117898420a(15) =543190777a(16) =2576904807a(17) =12017023329a(18) =57406615116a(19) =270239974452
External references
- oeis: A149381