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Search: id:A118544
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| A118544 |
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Number of subsets A of {1,2,...,n} with |A+A| = |A-A|. |
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+0
1
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| 2, 4, 8, 14, 24, 40, 66, 106, 174, 286, 480, 814, 1412, 2480, 4476, 8184, 15230, 28652, 54488, 104262
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(4)=14: two of the sixteen subsets of {1,2,3,4} have |A+A|<|A-A| (specifically, {1,3,4} and {1,2,4}).
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CROSSREFS
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Sequence in context: A015128 A123655 A084683 this_sequence A019274 A164173 A164162
Adjacent sequences: A118541 A118542 A118543 this_sequence A118545 A118546 A118547
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KEYWORD
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more,nonn
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AUTHOR
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Kevin O'Bryant (kevin(AT)member.ams.org), May 07 2006
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