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, 0, 0), (0, -1, 1), (1, 1, -1), (1, 1, 0)}.
A148784
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, 0, 0), (0, -1, 1), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =24a(5) =79a(6) =261a(7) =886a(8) =3129a(9) =11101a(10) =39877a(11) =146007a(12) =536573a(13) =1986096a(14) =7430086a(15) =27875577a(16) =105068168a(17) =398612268a(18) =1515643014a(19) =5781406946a(20) =22147965265a(21) =84995804118a(22) =326938348756
External references
- oeis: A148784