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), (-1, 1, 0), (1, -1, 0), (1, 1, 0)}.
A149528
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), (-1, 1, 0), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =11a(4) =55a(5) =155a(6) =775a(7) =2461a(8) =12305a(9) =41937a(10) =209685a(11) =749109a(12) =3745545a(13) =13841585a(14) =69207925a(15) =262382303a(16) =1311911515a(17) =5074609495a(18) =25373047475a(19) =99750359987a(20) =498751799935
External references
- oeis: A149528