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), (0, 1, 0), (1, 0, 0), (1, 1, -1)}.
A149823
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), (0, 1, 0), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =28a(5) =82a(6) =260a(7) =848a(8) =2824a(9) =9692a(10) =33728a(11) =119176a(12) =427142a(13) =1544640a(14) =5641356a(15) =20764928a(16) =76923198a(17) =286768066a(18) =1074457916a(19) =4044489594a(20) =15288513274a(21) =58000024522a(22) =220776174294a(23) =842888622120
External references
- oeis: A149823