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A003115
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a(0) = a(1) = 1; for n >= 2, a(n)=a(n-1)*4^[n/2]-a(n-2).
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0
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1, 1, 3, 11, 173, 2757, 176275, 11278843, 2887207533, 739113849605, 756849694787987, 775013348349049083, 3174453917988010255981, 13002562473065541659449093, 213033980384251916560403683731
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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REFERENCES
| D. H. Lehmer, Course on History of Mathematics, Univ. Calif. Berkeley, 1973.
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FORMULA
| a(n+2) = (4^(n+1) - 5)*a(n) - 4a(n-2).
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PROG
| (PARI) a(n)=if(n<2, n >= 0, 4^(n\2)*a(n-1)-a(n-2))
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CROSSREFS
| Sequence in context: A132561 A140538 A006485 * A053888 A118479 A103836
Adjacent sequences: A003112 A003113 A003114 * A003116 A003117 A003118
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Herman P. Robinson
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EXTENSIONS
| More terms from Michael Somos, Aug 23, 2000.
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