a(n) = Sum_{k=1..n} ceiling(k^4/n).

Terms

a(0) =1a(1) =9a(2) =34a(3) =90a(4) =199a(5) =382a(6) =672a(7) =1100a(8) =1707a(9) =2539a(10) =3640a(11) =5066a(12) =6875a(13) =9128a(14) =11898a(15) =15248a(16) =19265a(17) =24027a(18) =29624a(19) =36144a(20) =43685a(21) =52348a(22) =62242a(23) =73472a(24) =86157a(25) =100423a(26) =116382a(27) =134184a(28) =153943a(29) =175818