a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers), t = (natural numbers >= 2).

A024853

a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers), t = (natural numbers >= 2).

Terms

    a(0) =3a(1) =4a(2) =13a(3) =16a(4) =34a(5) =40a(6) =70a(7) =80a(8) =125a(9) =140a(10) =203a(11) =224a(12) =308a(13) =336a(14) =444a(15) =480a(16) =615a(17) =660a(18) =825a(19) =880a(20) =1078a(21) =1144a(22) =1378a(23) =1456a(24) =1729a(25) =1820a(26) =2135a(27) =2240a(28) =2600a(29) =2720

External references