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, 1), (0, 1, -1), (1, 0, 0)}.
A148079
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, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =24a(6) =63a(7) =183a(8) =537a(9) =1618a(10) =5055a(11) =15861a(12) =51109a(13) =166314a(14) =547505a(15) =1827009a(16) =6133802a(17) =20809959a(18) =71063163a(19) =244205379a(20) =844896468a(21) =2936454598a(22) =10260887025a(23) =36010311788a(24) =126874109569a(25) =448803378080
External references
- oeis: A148079