经验公式:a(n)=2*a(n-1)+14*a(n-2)-30*a(n3)-90*a(-n4)+210*a(nh-5)+350*a(n-6)-910*a n-18)-10010*a(n-19)+2002*a-210*a(n-27)+90*a
n mod 2=0的经验公式:a(n)=(1/1358954496)*n^16+(5/84934656)*n*15+(31/14155776)*n ^14+(2135/42467328)*n′13+(33847/42467328)*n〃12+(32735/3538944)*n²11+(431429/5308416)*n〃10+(1463225/2654208)*n*n^9+(5160755/1769472)*n´8+(8008825/663552)*n ^7+(12913699/331776)*n^6+(6965/72)*n*5+(139417/768)*n_4+(23855/96)*n_3+(3741/16)*n^2+135*n+36
n mod 2=1:a(n)=(1/1358594496)*n^16+(5/84934566)*n^15+(373/169869312)*n^14+(1435/28311522)*n^13+(275299/33738624)*n^12+(807985/84934566)*n^11+(14409143/169869312)*n^10+(49767325/84934566)*n^9+(2153003003/679477248)*n^8+(380990005/28311525)*n^7+(7598369275/169869312)*n^6+(9778683875/84934566)*n^5+(76415846875/3339738624)*n^4+(9127365625/28311552)*n^3+(2011296875/6291456)*n^2+(616328125/3145728)*n+(937890625/16777216)