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, 0), (-1, 0, 0), (-1, 1, -1), (1, -1, 0), (1, 1, 1)}.
A149557
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, 0), (-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) =15291a(9) =58641a(10) =278023a(11) =1107235a(12) =5295601a(13) =21602507a(14) =103888769a(15) =431979255a(16) =2088322907a(17) =8809419485a(18) =42735313349a(19) =182391672799a(20) =887657036207
External references
- oeis: A149557