Volume of torus (rounded down) with major radius = n and minor radius = n/3.

Terms

a(0) =2a(1) =17a(2) =59a(3) =140a(4) =274a(5) =473a(6) =752a(7) =1122a(8) =1598a(9) =2193a(10) =2919a(11) =3789a(12) =4818a(13) =6018a(14) =7402a(15) =8983a(16) =10775a(17) =12791a(18) =15043a(19) =17545a(20) =20311a(21) =23353a(22) =26685a(23) =30319a(24) =34269a(25) =38548a(26) =43169a(27) =48146a(28) =53491a(29) =59217