This sequence arose in connection with divisibility of Stirling numbers of the first kind. It took me a while to figure out a (slightly clumsy) explicit expression for the n-th term. Seeing that things are a bit slack on the list just now, I thought I'd share it with everybody. The terms for n = 0, ..., 257 follow below --- should suffice for a wet afternoon! WFL [0, 0, 0, 1, 0, 3, 1, 2, 0, 5, 2, 4, 1, 5, 2, 3, 0, 7, 3, 6, 2, 7, 3, 5, 1, 7, 3, 6, 2, 7, 3, 4, 0, 9, 4, 8, 3, 9, 4, 7, 2, 9, 4, 8, 3, 9, 4, 6, 1, 9, 4, 8, 3, 9, 4, 7, 2, 9, 4, 8, 3, 9, 4, 5, 0, 11, 5, 10, 4, 11, 5, 9, 3, 11, 5, 10, 4, 11, 5, 8, 2, 11, 5, 10, 4, 11, 5, 9, 3, 11, 5, 10, 4, 11, 5, 7, 1, 11, 5, 10, 4, 11, 5, 9, 3, 11, 5, 10, 4, 11, 5, 8, 2, 11, 5, 10, 4, 11, 5, 9, 3, 11, 5, 10, 4, 11, 5, 6, 0, 13, 6, 12, 5, 13, 6, 11, 4, 13, 6, 12, 5, 13, 6, 10, 3, 13, 6, 12, 5, 13, 6, 11, 4, 13, 6, 12, 5, 13, 6, 9, 2, 13, 6, 12, 5, 13, 6, 11, 4, 13, 6, 12, 5, 13, 6, 10, 3, 13, 6, 12, 5, 13, 6, 11, 4, 13, 6, 12, 5, 13, 6, 8, 1, 13, 6, 12, 5, 13, 6, 11, 4, 13, 6, 12, 5, 13, 6, 10, 3, 13, 6, 12, 5, 13, 6, 11, 4, 13, 6, 12, 5, 13, 6, 9, 2, 13, 6, 12, 5, 13, 6, 11, 4, 13, 6, 12, 5, 13, 6, 10, 3, 13, 6, 12, 5, 13, 6, 11, 4, 13, 6, 12, 5, 13, 6, 7, 0, ...]