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, 0, 1), (1, 0, -1), (1, 0, 0)}.
A149917
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, 0, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =47a(5) =155a(6) =545a(7) =1982a(8) =7366a(9) =28040a(10) =108465a(11) =425789a(12) =1698808a(13) =6859370a(14) =27955680a(15) =114943633a(16) =476154065a(17) =1986712591a(18) =8348735338a(19) =35294521877a(20) =149972186973a(21) =640252876498
External references
- oeis: A149917