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, -1, 0), (1, 1, 1)}.
A149558
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, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =59a(5) =193a(6) =895a(7) =3259a(8) =15359a(9) =58873a(10) =280173a(11) =1113879a(12) =5348147a(13) =21804729a(14) =105287385a(15) =437178569a(16) =2120520381a(17) =8935434007a(18) =43498711149a(19) =185440154245a(20) =905220919951
External references
- oeis: A149558