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2, 4, 8, 18, 42, 100, 240, 578, 1394, 3364, 8120, 19602, 47322, 114244, 275808, 665858, 1607522, 3880900, 9369320, 22619538, 54608394, 131836324, 318281040, 768398402, 1855077842, 4478554084, 10812186008, 26102926098, 63018038202, 152139002500, 367296043200, 886731088898, 2140758220994, 5168247530884
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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REFERENCES
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J. V. Leyendekkers and A. G. Shannon, Pellian sequence relationships among pi, e, sqrt(2), Notes on Number Theory and Discrete Mathematics, Vol. 18, 2012, No. 2, 58-62; http://www.nntdm.net/papers/nntdm-18/NNTDM-18-2-58-62.pdf. See Table 2.
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LINKS
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Table of n, a(n) for n=0..33.
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CROSSREFS
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Cf. A024537.
Sequence in context: A151381 A057151 A026699 * A078678 A261492 A027056
Adjacent sequences: A182777 A182778 A182779 * A182781 A182782 A182783
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Dec 23 2012
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STATUS
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approved
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