a(10) = 1356 as 1356 = 10101001100_2 = 1212020_3 = 111030_4 = 20411_5 = 10140_6 = 3645_7 = 2514_8 = 1766_9 = 1356_10 whose digit reversals are 110010101_2 = 405, 202121_3 = 556, 30111_4 = 789, 11402_5 = 852, 4101_6 = 901, 5463_7 = 1956, 4152_8 = 2154, 6671_9 = 4924, 6531_10 = 6531, and 405 < 556 < 789 < 852 < 901 < 1956 < 2154 < 4924 < 6531.
