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), (0, 1, -1), (0, 1, 1), (1, 0, 0)}.
A150001
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), (0, 1, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =60a(5) =211a(6) =804a(7) =3154a(8) =12245a(9) =49553a(10) =203027a(11) =827595a(12) =3454623a(13) =14536494a(14) =60950967a(15) =259576170a(16) =1111789372a(17) =4749638623a(18) =20516611834a(19) =88993314253a(20) =385309493927
External references
- oeis: A150001