Third partial sums of eighth powers (A001016).

Terms

a(0) =1a(1) =259a(2) =7335a(3) =86765a(4) =629174a(5) =3314178a(6) =13906578a(7) =49183590a(8) =152191935a(9) =422931613a(10) =1075761505a(11) =2540663307a(12) =5633367740a(13) =11829663860a(14) =23692442292a(15) =45516670332a(16) =84278105421a(17) =150996708135a(18) =262656041515a(19) =444856105561a(20) =735419759634