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Search: id:A139784
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| A139784 |
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a(4n+1)=2a(4n), a(4n+2)=2a(4n+1), a(4n+3)=2a(4n+2), a(4n+4)=2a(4n+3)+A007583(n). |
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+0
2
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| 0, 0, 0, 0, 1, 2, 4, 8, 19, 38, 76, 152, 315, 630, 1260, 2520, 5083, 10166, 20332, 40664, 81499, 162998, 325996, 651992, 1304667, 2609334, 5218668, 10437336, 20877403, 41754806, 83509612, 167019224, 334049371, 668098742, 1336197484, 2672394968
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OFFSET
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0,6
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COMMENT
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a(0), a(4), a(8) and a(12) are the first terms of A111420. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 18 2008
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FORMULA
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a(4n+s) = 2^s*(-1/45+7*16^n/90-4^n/18), s=0,1,2,3. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 18 2008
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CROSSREFS
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Cf. a(0), a(4), a(8), a(12) in A111420.
Adjacent sequences: A139781 A139782 A139783 this_sequence A139785 A139786 A139787
Sequence in context: A007881 A049960 A018306 this_sequence A072925 A037444 A099526
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), May 16 2008
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EXTENSIONS
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Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 18 2008
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