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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A026904 Number of sets S of positive integers satisfying E(S)=n, where E = 2nd elementary symmetric function; e.g. a(2)=2 counts {1,11},{1,2,3}. 0
0, 1, 1, 1, 1, 2, 1, 2, 1, 2, 2, 3, 1, 3, 2, 2, 2, 3, 2, 4, 2, 2, 3, 4, 1, 4, 3, 3, 3, 4, 3, 4, 2, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..34.

CROSSREFS

Sequence in context: A291598 A287820 A191373 * A057828 A082498 A112223

Adjacent sequences:  A026901 A026902 A026903 * A026905 A026906 A026907

KEYWORD

nonn

AUTHOR

Clark Kimberling

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 October 21 05:29 EDT 2017. Contains 293679 sequences.