OEIS The On-Line Encyclopedia of Integer Sequences utf-8 data:image/x-icon;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAgMAAABinRfyAAAACVBMVEVBQaf/AAD8/6LeV8/ZAAAAAWJLR0QAiAUdSAAAAAlwSFlzAAALEwAACxMBAJqcGAAAAAd0SU1FB9UMHRU3G+krTTwAAAA/SURBVHjaY1gFBAxLl6ZNY5iVtiyLYVbqsjAQaxlILIoBLAsmFoGIJgiLQ4th0YpFXRCioQvIXdUFUqe1ahUAwe4kFgzRvYQAAAAASUVORK5CYII= 7 http://oeis.org/oeis.xml http://oeis.org/oeis.png http://oeis.org/search