Apply partial sum operator thrice to sequence of squares of the first n primes.

Terms

a(0) =4a(1) =21a(2) =76a(3) =218a(4) =568a(5) =1295a(6) =2688a(7) =5108a(8) =9084a(9) =15457a(10) =25188a(11) =39646a(12) =60512a(13) =89635a(14) =129224a(15) =182088a(16) =251708a(17) =341805a(18) =456868a(19) =601938a(20) =782344a(21) =1004327a(22) =1274776a(23) =1601612a(24) =1994244a(25) =2462873a(26) =3018108a(27) =3671398a(28) =4434624a(29) =5320555