List of words over {1,2} with equal numbers of 1's and 2's.

Terms

a(0) =12a(1) =21a(2) =1122a(3) =1212a(4) =1221a(5) =2112a(6) =2121a(7) =2211a(8) =111222a(9) =112122a(10) =112212a(11) =112221a(12) =121122a(13) =121212a(14) =121221a(15) =122112a(16) =122121a(17) =122211a(18) =211122a(19) =211212a(20) =211221a(21) =212112a(22) =212121a(23) =212211a(24) =221112a(25) =221121a(26) =221211a(27) =222111a(28) =11112222a(29) =11121222