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, 0), (0, 0, -1), (0, 0, 1), (1, 1, 1)}.
A150759
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, 0), (0, 0, -1), (0, 0, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =30a(4) =120a(5) =504a(6) =2126a(7) =9170a(8) =40044a(9) =176044a(10) =781600a(11) =3490012a(12) =15664056a(13) =70669628a(14) =320004610a(15) =1454279906a(16) =6630320468a(17) =30309488628a(18) =138910831512a(19) =638073465476
External references
- oeis: A150759