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1, 3, 7, 17, 41, 87, 187, 412, 937, 2162, 5298, 12354, 29994, 74094, 182994, 444354, 1081419, 2737788, 6745792, 16765802, 41815827, 105943891, 261683475, 655537299, 1668304275
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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3, 7, 17, 41, 937 and 105943891 are primes.
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LINKS
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EXAMPLE
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a(12) = 1 + 2 + 4 + 10 + 24 + 46 + 100 + 225 + 525 + 1225 + 3136 + 7056 = 12354.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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