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, 0), (0, -1, 0), (0, 0, 1), (1, 1, -1)}.
A148451
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, 0), (0, -1, 0), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =17a(5) =51a(6) =171a(7) =589a(8) =2049a(9) =7409a(10) =27508a(11) =103052a(12) =392031a(13) =1517989a(14) =5935172a(15) =23393990a(16) =93204843a(17) =374588839a(18) =1514534730a(19) =6164304590a(20) =25261163401a(21) =104062614425a(22) =430672375871
External references
- oeis: A148451