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Search: id:A003115
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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
1
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| 1, 1, 3, 11, 173, 2757, 176275, 11278843, 2887207533, 739113849605, 756849694787987, 775013348349049083, 3174453917988010255981, 13002562473065541659449093, 213033980384251916560403683731
(list; graph; listen)
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OFFSET
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0,3
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REFERENCES
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D. H. Lehmer, Course on History of Mathematics, Univ. Calif. Berkeley, 1973.
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FORMULA
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a(n+2) = (4^(n+1) - 5)*a(n) - 4a(n-2).
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PROGRAM
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(PARI) a(n)=if(n<2, n >= 0, 4^(n\2)*a(n-1)-a(n-2))
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CROSSREFS
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Sequence in context: A080987 A132561 A006485 this_sequence A053888 A118479 A103836
Adjacent sequences: A003112 A003113 A003114 this_sequence A003116 A003117 A003118
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KEYWORD
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nonn,easy
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AUTHOR
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njas, Herman P. Robinson
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EXTENSIONS
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More terms from Michael Somos, Aug 23, 2000.
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