= "<tr>";
		for(var j = 0; j < app_degree + 1; ++j) {
			formula_html += "<td style=\"padding:4pt 4pt 4pt 4pt;\">";
			if(i + j == 0) {
				formula_html += "n";
			} else {
				formula_html += "<table style=\"font-family: sans-serif; font-size: 16pt;\">";
				formula_html += "<tr><td align=\"center\" style=\"font-size: 10pt;\">";
				formula_html += "n";
				formula_html += "</td><td rowspan=3>";
				if(i + j == 1)
					formula_html += "<table><tr><td rowspan=2>x</td><td style=\"font-size: 10pt;\">&nbsp;</t