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, 1), (-1, 1, 0), (1, 0, -1), (1, 1, 1)}.
A149636
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, 1), (-1, 1, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =69a(5) =233a(6) =1123a(7) =4193a(8) =20445a(9) =79657a(10) =391523a(11) =1581335a(12) =7802551a(13) =32250205a(14) =159611321a(15) =671656495a(16) =3331359929a(17) =14211713979a(18) =70601547625a(19) =304539943445
External references
- oeis: A149636