This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A087085 Sum of the integer elements in the subsets of the subsets of the integers 1 to n. 0
 0, 0, 2, 48, 3072, 2621440, 515396075520, 6198106008766409342976, 304893000761160863263183648258864317464576 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 REFERENCES Alan Sutcliffe, Divisors and Common Factors in Sets of Integers, awaiting publication. LINKS FORMULA n*(n-1)*2^(n-4+2^(n-1)) EXAMPLE a(3)=48 since the 16 subsets of the sets ( ) (1) (2) (1,2) are ( ) (( )) ((1)) ((2)) ((1,2)) (( ) (1)) (( ) (2)) (( ) (1,2)) ((1) (2)) ((1) (1,2)) ((2) (1,2)) (( ) (1) (2)) (( ) (1) (1,2)) (( ) (2) (1,2)) ((1) (2) (1,2)) (( ) (1) (2) (1,2)) and the sum of the 32 integer elements is 48. CROSSREFS A001146 gives the number of subsets of the subsets of the integers 1 to n. A028369 gives the number of subset elements in the subsets of the subsets of the integers 1 to n. A087084 gives the number of integer elements in the subsets of the subsets of the integers 1 to n. Sequence in context: A186416 A210723 A322750 * A067626 A053071 A238838 Adjacent sequences:  A087082 A087083 A087084 * A087086 A087087 A087088 KEYWORD easy,nonn AUTHOR Alan Sutcliffe (alansut(AT)ntlworld.com), Aug 13 2003 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 18 07:11 EDT 2019. Contains 326072 sequences. (Running on oeis4.)