Christian Stump posted a note on <https://math.stackexchange.com/questions/3257689>. I tried to put all together in <https://oeis.org/draft/A263484>: - Allan's comment and name change, - Fred's and Christian's "more" terms (up to row 9) - the link to the math.stackexchange.org discussion Please feel free to amend/change that draft. Regards - Georg