a(n) = floor(M(g(n-1)+1,..,g(n))), where M is the harmonic mean and g(n) = n^4.

Terms

a(0) =1a(1) =6a(2) =40a(3) =152a(4) =413a(5) =920a(6) =1792a(7) =3173a(8) =5232a(9) =8160a(10) =12173a(11) =17512a(12) =24440a(13) =33245a(14) =44240a(15) =57760a(16) =74165a(17) =93840a(18) =117192a(19) =144653a(20) =176680a(21) =213752a(22) =256373a(23) =305072a(24) =360400a(25) =422933a(26) =493272a(27) =572040a(28) =659885a(29) =757480