a(n) = n*(n+1) + (n+2)*(n+3) + (n+4)*(n+5) + (n+6)*(n+7).

Terms

a(0) =68a(1) =100a(2) =140a(3) =188a(4) =244a(5) =308a(6) =380a(7) =460a(8) =548a(9) =644a(10) =748a(11) =860a(12) =980a(13) =1108a(14) =1244a(15) =1388a(16) =1540a(17) =1700a(18) =1868a(19) =2044a(20) =2228a(21) =2420a(22) =2620a(23) =2828a(24) =3044a(25) =3268a(26) =3500a(27) =3740a(28) =3988a(29) =4244