a(n) = floor(1/(zeta(4) - Sum_{h=1..n} 1/h^4)).

Terms

a(0) =12a(1) =50a(2) =133a(3) =280a(4) =507a(5) =833a(6) =1276a(7) =1855a(8) =2586a(9) =3488a(10) =4579a(11) =5878a(12) =7401a(13) =9167a(14) =11194a(15) =13501a(16) =16104a(17) =19022a(18) =22273a(19) =25876a(20) =29847a(21) =34205a(22) =38968a(23) =44155a(24) =49782a(25) =55868a(26) =62431a(27) =69490a(28) =77061a(29) =85163