Rounded volume of a regular tetrahedron with edge length n.

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =8a(5) =15a(6) =25a(7) =40a(8) =60a(9) =86a(10) =118a(11) =157a(12) =204a(13) =259a(14) =323a(15) =398a(16) =483a(17) =579a(18) =687a(19) =808a(20) =943a(21) =1091a(22) =1255a(23) =1434a(24) =1629a(25) =1841a(26) =2071a(27) =2320a(28) =2587a(29) =2874