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, -1, 0), (1, 0, 0), (1, 0, 1)}.
A149902
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, -1, 0), (1, 0, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =47a(5) =159a(6) =579a(7) =2119a(8) =8299a(9) =32155a(10) =129903a(11) =521605a(12) =2168721a(13) =8937214a(14) =37854276a(15) =159143916a(16) =684442662a(17) =2922266602a(18) =12717021946a(19) =54977669121a(20) =241582801230
External references
- oeis: A149902