A140595 Vertical lecture of A140485 (1,4,9,13) .If signed, a=1-1/2+1/3-1/4+1/5 is a constant "not to far" from log2=0.69315.With transform in A100597,A129891 or A130620, the corresponding polynomial family has roots along a curve which is to compare to fig 2 of P. Flajolet, X. Gourdon, B.Salvy Gazette des Mathematiciens 1993, 55, pp. 67-78.

1, 2, 3, 4, 5, 6, 7, 9, 8, 11, 10, 13, 14, 12, 15, 16, 18, 19, 17, 21, 23, 22, 20, 25, 26, 24, 27, 28, 29, 30, 31, 32, 33, 34, 35, 37