login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A176310 G.f.: exp( Sum_{n>=1} sigma(n*2^n)*x^n/n ). 4
1, 3, 12, 47, 157, 531, 1741, 5459, 16814, 51286, 152506, 447622, 1300571, 3721897, 10551143, 29663448, 82494469, 227701487, 624113377, 1697228926, 4586879327, 12323255188, 32904418872, 87395198231, 230972180615, 607363842960 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..25.

FORMULA

The logarithmic derivative is A176311.

PROG

(PARI) {a(n)=polcoeff(exp(sum(k=1, n, sigma(k*2^k)*x^k/k)+x*O(x^n)), n)}

CROSSREFS

Cf. A176311, A000203 (sigma).

Sequence in context: A108368 A264514 A216946 * A077829 A088132 A122450

Adjacent sequences:  A176307 A176308 A176309 * A176311 A176312 A176313

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Apr 15 2010

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 3 21:14 EST 2016. Contains 278745 sequences.