a(n) = (3/2)*A019565((2n-1)^2) - A019565(A001065((2n-1)^2)), where A019565 is the base-2 exp-function, and A001065 is the sum of proper divisors of n.
A379501
a(n) = (3/2)*A019565((2n-1)^2) - A019565(A001065((2n-1)^2)), where A019565 is the base-2 exp-function, and A001065 is the sum of proper divisors of n.
Terms
- a(0) =2a(1) =16a(2) =216a(3) =422a(4) =470a(5) =51016a(6) =5082a(7) =4446a(8) =864a(9) =106688a(10) =1301846a(11) =880a(12) =204182a(13) =1985872a(14) =236964a(15) =646310a(16) =1030a(17) =176778a(18) =2799756a(19) =96178962a(20) =563400a(21) =62092576a(22) =1566805968a(23) =27274a(24) =559406a(25) =-16252236a(26) =1040774592a(27) =263042394a(28) =7794826a(29) =115781204
External references
- oeis: A379501