1<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> 2 <mrow> 3 <msub> 4 <mi>L</mi> 5 <mrow> 6 <mi>n</mi> 7 <mo>+</mo> 8 <mn>1</mn> 9 </mrow> 10 </msub> 11 <mfenced> 12 <mrow> 13 <mi>x</mi> 14 </mrow> 15 </mfenced> 16 <mspace width="1em"/> 17 <mo>=</mo> 18 <mspace width="1em"/> 19 <mfrac> 20 <mrow> 21 <mfenced> 22 <mrow> 23 <mn>2</mn> 24 <mi>n</mi> 25 <mo>+</mo> 26 <mn>1</mn> 27 <mo>−</mo> 28 <mi>x</mi> 29 </mrow> 30 </mfenced> 31 <msub> 32 <mi>L</mi> 33 <mi>n</mi> 34 </msub> 35 <mfenced> 36 <mrow> 37 <mi>x</mi> 38 </mrow> 39 </mfenced> 40 <mo>−</mo> 41 <mi>n</mi> 42 <msub> 43 <mi>L</mi> 44 <mrow> 45 <mi>n</mi> 46 <mo>−</mo> 47 <mn>1</mn> 48 </mrow> 49 </msub> 50 <mfenced> 51 <mrow> 52 <mi>x</mi> 53 </mrow> 54 </mfenced> 55 </mrow> 56 <mfenced> 57 <mrow> 58 <mi>n</mi> 59 <mo>+</mo> 60 <mn>1</mn> 61 </mrow> 62 </mfenced> 63 </mfrac> 64 </mrow> 65</math> 66 67