For other results concerning the concordance genus, see the reference below. Most of the results for 11 crossing knots were found by John McAtee, to appear soon in a preprint.
For knots that are concordant to lower genus knots, the simplest such knot is listed in a document linked to the number in the table.
Clearly the concordance genus is dependent on the category, smooth or topological, locally flat. The first known example of this occurs for knots that are topologically slice, and thus topological concordance genus = 0, but are not smoothly slice, so smooth concordance genus > 0. Since, as of yet, this distinction is extremely rare, and we concentrate on the smooth case. (The only known distinction on the chart occurs with 11n34, which is topologically slice, but we do not know its smooth concordance genus.)
C. Livingston, The concordance genus of knots, Algebr. Geom. Topol. 4 (2004) 1-22. Arxiv:math.GT/0107141