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, -1, 1), (-1, 0, 1), (0, 1, 0), (1, 0, 0)}.
A149913
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, -1, 1), (-1, 0, 1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =45a(5) =151a(6) =534a(7) =1908a(8) =7077a(9) =26363a(10) =99731a(11) =385722a(12) =1500738a(13) =5908426a(14) =23420848a(15) =93218448a(16) =374489328a(17) =1512456395a(18) =6138406354a(19) =25036743646a(20) =102388294518a(21) =420457587808
External references
- oeis: A149913