Sums of the squares of the elements in the subsets of the integers 1 to n.

Terms

a(0) =0a(1) =1a(2) =10a(3) =56a(4) =240a(5) =880a(6) =2912a(7) =8960a(8) =26112a(9) =72960a(10) =197120a(11) =518144a(12) =1331200a(13) =3354624a(14) =8314880a(15) =20316160a(16) =49020928a(17) =116981760a(18) =276430848a(19) =647495680a(20) =1504706560a(21) =3471835136a(22) =7958691840a(23) =18136170496a(24) =41104179200a(25) =92694118400a(26) =208071032832