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, 1)}.
A148775
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, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =23a(5) =70a(6) =230a(7) =739a(8) =2500a(9) =8370a(10) =28991a(11) =99970a(12) =349834a(13) =1226731a(14) =4351244a(15) =15435419a(16) =55192536a(17) =197505927a(18) =711400471a(19) =2564339924a(20) =9282708868a(21) =33648704177a(22) =122394201777a(23) =445702835088
External references
- oeis: A148775