A152592 is "Consider last letter of the sequence zero, one, two, three, four, five, ... . Write down 0 for a vowel, 1 for a consonant." However, it has a(20) = 1; but the "y" at the end of "twenty" is a vowel! (Anybody remember "a, e, i, o, u, and sometimes y"?) Franklin T. Adams-Watters