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, 1), (-1, 1, -1), (1, -1, 0), (1, 1, 0)}.
A149138
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, 1), (-1, 1, -1), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =36a(5) =109a(6) =451a(7) =1545a(8) =6616a(9) =24187a(10) =106547a(11) =405517a(12) =1824646a(13) =7147933a(14) =32650828a(15) =130817529a(16) =604062624a(17) =2464690317a(18) =11474497491a(19) =47519635981a(20) =222697034994a(21) =933589455107
External references
- oeis: A149138