a(n) = ((p-1)^3 - (p-1)^2)/4 where p is the n-th prime.

Terms

a(0) =0a(1) =1a(2) =12a(3) =45a(4) =225a(5) =396a(6) =960a(7) =1377a(8) =2541a(9) =5292a(10) =6525a(11) =11340a(12) =15600a(13) =18081a(14) =23805a(15) =34476a(16) =47937a(17) =53100a(18) =70785a(19) =84525a(20) =92016a(21) =117117a(22) =136161a(23) =168432a(24) =218880a(25) =247500a(26) =262701a(27) =294945a(28) =312012a(29) =348096