Nearest integer to n^(7/2).

Terms

a(0) =0a(1) =1a(2) =11a(3) =47a(4) =128a(5) =280a(6) =529a(7) =907a(8) =1448a(9) =2187a(10) =3162a(11) =4414a(12) =5986a(13) =7921a(14) =10267a(15) =13071a(16) =16384a(17) =20257a(18) =24743a(19) =29898a(20) =35777a(21) =42439a(22) =49944a(23) =58351a(24) =67723a(25) =78125a(26) =89620a(27) =102276a(28) =116159a(29) =131339