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, 1, -1), (1, 0, 0), (1, 0, 1)}.
A149869
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, 1, -1), (1, 0, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =42a(5) =138a(6) =482a(7) =1654a(8) =6153a(9) =22665a(10) =86602a(11) =325298a(12) =1282358a(13) =4990247a(14) =19921217a(15) =78358303a(16) =318886120a(17) =1281888719a(18) =5254017106a(19) =21261292818a(20) =88301518722a(21) =362702052232
External references
- oeis: A149869