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Search: id:A152764
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| 1, 111, 11011, 1100011, 110000011, 11000000011, 1100000000011, 110000000000011, 11000000000000011, 1100000000000000011, 110000000000000000011, 11000000000000000000011
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n)=11+11000*100^(n-3)-(111/10)*{C[2*(n-1),n-1] mod 2}-10*{C[2*(n-2),n-2] mod 2}, with n>=1 [From Paolo P. Lava (ppl(AT)spl.at), Dec 23 2008]
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EXAMPLE
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n ...... a(n)
1 ....... 1
2 ...... 111
3 ..... 11011
4 .... 1100011
5 ... 110000011
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CROSSREFS
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Cf. A135577, A138120, A138146, A152756, A152758, A058764.
Sequence in context: A012039 A135577 A153498 this_sequence A138146 A100706 A111864
Adjacent sequences: A152761 A152762 A152763 this_sequence A152765 A152766 A152767
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KEYWORD
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easy,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Dec 14 2008
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