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Search: id:A039799
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| A039799 |
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For S a subset of [ n ]={1,2,3,...n}, let B_S={x+y:x,y in S, x<y}; then a(n) is maximal cardinality of B_S intersect B_{[ n ]-S}. |
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+0
1
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| 1, 1, 2, 3, 6, 6, 9, 10, 12, 14, 17
(list; graph; listen)
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OFFSET
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5,3
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EXAMPLE
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a(7)=3 since we can divide [ 7 ] into S={1,5,6} and T={2,3,4,7} giving B_S={6,7,11} and B_T={5,6,7,9,10,11}, with intersection {6,7,11} of cardinality 3.
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CROSSREFS
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Sequence in context: A023832 A080235 A056907 this_sequence A144583 A155215 A119319
Adjacent sequences: A039796 A039797 A039798 this_sequence A039800 A039801 A039802
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KEYWORD
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hard,nonn
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AUTHOR
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Erich Friedman (erich.friedman(AT)stetson.edu)
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