a(n) = Sum_{d|n, n/d odd} d^6 for n > 0.

Terms

a(0) =1a(1) =64a(2) =730a(3) =4096a(4) =15626a(5) =46720a(6) =117650a(7) =262144a(8) =532171a(9) =1000064a(10) =1771562a(11) =2990080a(12) =4826810a(13) =7529600a(14) =11406980a(15) =16777216a(16) =24137570a(17) =34058944a(18) =47045882a(19) =64004096a(20) =85884500a(21) =113379968a(22) =148035890a(23) =191365120a(24) =244156251a(25) =308915840a(26) =387952660