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, 0, 0), (-1, 1, -1), (1, 0, 0), (1, 0, 1)}.
A150307
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, 0, 0), (-1, 1, -1), (1, 0, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =21a(4) =83a(5) =287a(6) =1220a(7) =4555a(8) =20190a(9) =78993a(10) =359409a(11) =1451062a(12) =6720199a(13) =27751565a(14) =130164832a(15) =546754411a(16) =2588819975a(17) =11019871896a(18) =52557679338a(19) =226126679991
External references
- oeis: A150307