S⁡n=12⁢n2⁢ln⁡n-14⁢n2+12⁢n⁢ln⁡n+112⁢ln⁡n+C+∑s=2m-1-B2⁢s2⁢s⁢2⁢s-1⁢2⁢s-2⁢1n2⁢s-2+Rm⁡n,