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, 1, -1), (1, 0, 0), (1, 0, 1)}.
A149863
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, 1, -1), (1, 0, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =40a(5) =123a(6) =412a(7) =1341a(8) =4746a(9) =16272a(10) =58855a(11) =206111a(12) =763450a(13) =2740091a(14) =10250705a(15) =37195701a(16) =140952500a(17) =518767740a(18) =1976234997a(19) =7321175439a(20) =28112193490a(21) =105105989815a(22) =404852222574
External references
- oeis: A149863