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), (0, -1, 1), (1, 0, -1), (1, 1, 0)}.
A149184
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), (0, -1, 1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =36a(5) =123a(6) =451a(7) =1715a(8) =6570a(9) =26133a(10) =104173a(11) =424824a(12) =1744847a(13) =7246790a(14) =30390296a(15) =128177201a(16) =545456346a(17) =2331067303a(18) =10029452264a(19) =43334144418a(20) =188114344033a(21) =820064019107
External references
- oeis: A149184