a(n) = floor((n + 1/2)^5).

Terms

a(0) =0a(1) =7a(2) =97a(3) =525a(4) =1845a(5) =5032a(6) =11602a(7) =23730a(8) =44370a(9) =77378a(10) =127628a(11) =201135a(12) =305175a(13) =448403a(14) =640973a(15) =894660a(16) =1222981a(17) =1641308a(18) =2166998a(19) =2819506a(20) =3620506a(21) =4594013a(22) =5766503a(23) =7167031a(24) =8827351a(25) =10782039a(26) =13068609a(27) =15727636a(28) =18802876