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), (0, 1, 1), (1, 0, -1)}.
A148450
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), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =17a(5) =50a(6) =171a(7) =569a(8) =1990a(9) =7154a(10) =26001a(11) =96687a(12) =363451a(13) =1383819a(14) =5329430a(15) =20678799a(16) =81004721a(17) =319442630a(18) =1267842963a(19) =5062978205a(20) =20322019887a(21) =81973348695a(22) =332106710789
External references
- oeis: A148450