a(n) = (-tau(n) + sigma_11(n)) / 691, where tau is Ramanujan's tau (A000594), sigma_11(n) = Sum_{ d divides n } d^11 (A013959).

A027860

a(n) = (-tau(n) + sigma_11(n)) / 691, where tau is Ramanujan's tau (A000594), sigma_11(n) = Sum_{ d divides n } d^11 (A013959).

Terms

    a(0) =0a(1) =3a(2) =256a(3) =6075a(4) =70656a(5) =525300a(6) =2861568a(7) =12437115a(8) =45414400a(9) =144788634a(10) =412896000a(11) =1075797268a(12) =2593575936a(13) =5863302600a(14) =12517805568a(15) =25471460475a(16) =49597544448a(17) =93053764671a(18) =168582124800a(19) =296526859818a(20) =506916761600a(21) =846025507836

External references