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, 1), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
A148880
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, 1), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =30a(5) =95a(6) =394a(7) =1413a(8) =6120a(9) =23777a(10) =105735a(11) =432536a(12) =1960862a(13) =8311068a(14) =38227676a(15) =166294916a(16) =773396585a(17) =3431950486a(18) =16099467674a(19) =72568131096a(20) =342780859121
External references
- oeis: A148880