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, 1, 1), (1, -1, 0), (1, 1, 1)}.
A149574
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, 1, 1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =63a(5) =203a(6) =1007a(7) =3611a(8) =17981a(9) =68397a(10) =341145a(11) =1350105a(12) =6740921a(13) =27424021a(14) =137005923a(15) =569013889a(16) =2843565991a(17) =11999840845a(18) =59979114067a(19) =256350760835
External references
- oeis: A149574