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, -1, 1), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
A148961
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, -1, 1), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =31a(5) =103a(6) =407a(7) =1533a(8) =6125a(9) =24959a(10) =103117a(11) =433129a(12) =1849783a(13) =7940861a(14) =34601631a(15) =151634999a(16) =669851379a(17) =2981419261a(18) =13336184581a(19) =60013632895a(20) =271390475929
External references
- oeis: A148961