a(n) = floor(n^sqrt(2*Pi)).

Terms

a(0) =1a(1) =5a(2) =15a(3) =32a(4) =56a(5) =89a(6) =131a(7) =183a(8) =246a(9) =321a(10) =407a(11) =507a(12) =619a(13) =746a(14) =887a(15) =1042a(16) =1214a(17) =1401a(18) =1604a(19) =1824a(20) =2062a(21) =2317a(22) =2590a(23) =2881a(24) =3192a(25) =3522a(26) =3871a(27) =4241a(28) =4631a(29) =5041