Rounded volume of a regular octahedron with edge length n.

Terms

a(0) =0a(1) =0a(2) =4a(3) =13a(4) =30a(5) =59a(6) =102a(7) =162a(8) =241a(9) =344a(10) =471a(11) =627a(12) =815a(13) =1036a(14) =1294a(15) =1591a(16) =1931a(17) =2316a(18) =2749a(19) =3233a(20) =3771a(21) =4366a(22) =5020a(23) =5736a(24) =6517a(25) =7366a(26) =8285a(27) =9279a(28) =10348a(29) =11497