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), (-1, 1, -1), (1, 0, 0), (1, 1, -1)}.
A148230
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), (-1, 1, -1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =33a(6) =123a(7) =366a(8) =1468a(9) =4743a(10) =19935a(11) =68259a(12) =296270a(13) =1059045a(14) =4703653a(15) =17371257a(16) =78488374a(17) =297384019a(18) =1361456225a(19) =5266059738a(20) =24359357814a(21) =95838621697a(22) =447027183728
External references
- oeis: A148230