1.已知数列{an}\{a_{n}\}{an}满足:a1+a2=0a_{1}+a_{2}=0a1+a2=0,an+2+(−1)n(n+1)2an=2{a}_{n+2}+{(-1)}^{\frac{n(n+1)}{2}}{a}_{n}=2an+2+(−1)2n(n+1)an=2,则数列{an}\{a_{n}\}{an}的前100项的和为((( )))