a(n) = s(1)*s(n) + s(2)*s(n-1) + ... + s(k)*s(n+1-k), where k = floor((n+1)/2), s = (natural numbers >= 3).

A024312

a(n) = s(1)*s(n) + s(2)*s(n-1) + ... + s(k)*s(n+1-k), where k = floor((n+1)/2), s = (natural numbers >= 3).

Terms

    a(0) =9a(1) =12a(2) =31a(3) =38a(4) =70a(5) =82a(6) =130a(7) =148a(8) =215a(9) =240a(10) =329a(11) =362a(12) =476a(13) =518a(14) =660a(15) =712a(16) =885a(17) =948a(18) =1155a(19) =1230a(20) =1474a(21) =1562a(22) =1846a(23) =1948a(24) =2275a(25) =2392a(26) =2765a(27) =2898a(28) =3320a(29) =3470

External references