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, 0, 0), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
A148989
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, 0, 0), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =114a(6) =444a(7) =1699a(8) =6929a(9) =27913a(10) =117303a(11) =489207a(12) =2099583a(13) =8964785a(14) =39080063a(15) =169775056a(16) =749045576a(17) =3297109440a(18) =14686154108a(19) =65314573848a(20) =293187891314
External references
- oeis: A148989