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, -1), (1, 0, 1), (1, 1, 0)}.
A150068
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, -1), (1, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =64a(5) =214a(6) =804a(7) =2830a(8) =10890a(9) =39446a(10) =153802a(11) =567328a(12) =2229518a(13) =8327630a(14) =32890296a(15) =123975918a(16) =491284276a(17) =1864701156a(18) =7406431598a(19) =28264755206a(20) =112450465794a(21) =431021149668
External references
- oeis: A150068