List of words over {1,5} with equal numbers of 1's and 5's.

Terms

a(0) =15a(1) =51a(2) =1155a(3) =1515a(4) =1551a(5) =5115a(6) =5151a(7) =5511a(8) =111555a(9) =115155a(10) =115515a(11) =115551a(12) =151155a(13) =151515a(14) =151551a(15) =155115a(16) =155151a(17) =155511a(18) =511155a(19) =511515a(20) =511551a(21) =515115a(22) =515151a(23) =515511a(24) =551115a(25) =551151a(26) =551511a(27) =555111