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, 0), (-1, 0, -1), (0, 0, 1), (1, 0, 0), (1, 1, -1)}.
A149961
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, 0), (-1, 0, -1), (0, 0, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =54a(5) =186a(6) =687a(7) =2614a(8) =10023a(9) =39628a(10) =159479a(11) =644852a(12) =2651704a(13) =11030534a(14) =46042484a(15) =194231590a(16) =825972969a(17) =3521799221a(18) =15126135652a(19) =65350163853a(20) =282935812697
External references
- oeis: A149961