a(n) = (sigma(2*n) - sigma(n))*Lucas(n) where Lucas(n) = A000204(n) and sigma(n) = A000203(n) is the sum of divisors of n.

A225525

a(n) = (sigma(2*n) - sigma(n))*Lucas(n) where Lucas(n) = A000204(n) and sigma(n) = A000203(n) is the sum of divisors of n.

Terms

    a(0) =2a(1) =12a(2) =32a(3) =56a(4) =132a(5) =288a(6) =464a(7) =752a(8) =1976a(9) =2952a(10) =4776a(11) =10304a(12) =14588a(13) =26976a(14) =65472a(15) =70624a(16) =128556a(17) =300456a(18) =373960a(19) =726096a(20) =1566464a(21) =1900944a(22) =3075792a(23) =6635648a(24) =10401182a(25) =15200808a(26) =35136320a(27) =45481408a(28) =68991060a(29) =178607808

External references