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), (0, 0, -1), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.
A149104
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), (0, 0, -1), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =8a(4) =34a(5) =86a(6) =379a(7) =1109a(8) =4982a(9) =15733a(10) =71949a(11) =241112a(12) =1113488a(13) =3883382a(14) =18098701a(15) =65184740a(16) =305739740a(17) =1128669680a(18) =5322848456a(19) =20056405409a(20) =95002397740a(21) =364024517530
External references
- oeis: A149104