a(n) = (prime(n)^2 - 1)/24.

Terms

a(0) =1a(1) =2a(2) =5a(3) =7a(4) =12a(5) =15a(6) =22a(7) =35a(8) =40a(9) =57a(10) =70a(11) =77a(12) =92a(13) =117a(14) =145a(15) =155a(16) =187a(17) =210a(18) =222a(19) =260a(20) =287a(21) =330a(22) =392a(23) =425a(24) =442a(25) =477a(26) =495a(27) =532a(28) =672a(29) =715