a(n) equals the square of the n-th partial sum added to twice the n-th partial sum of the squares, divided by a(n-1), for all n>1, with a(0)=1, a(1)=3.

A088132

a(n) equals the square of the n-th partial sum added to twice the n-th partial sum of the squares, divided by a(n-1), for all n>1, with a(0)=1, a(1)=3.

Terms

    a(0) =1a(1) =3a(2) =12a(3) =47a(4) =185a(5) =728a(6) =2865a(7) =11275a(8) =44372a(9) =174623a(10) =687217a(11) =2704496a(12) =10643361a(13) =41886227a(14) =164840412a(15) =648718287a(16) =2552986921a(17) =10047107272a(18) =39539710801a(19) =155605856283a(20) =612376317860

External references