| 4, 3, 12, 8, 24, 15, 40, 24, 60, 35, 84, 48, 112, 63, 144, 80, 180, 99, 220, 120, 264, 143, 312, 168, 364, 195, 420, 224, 480, 255, 544, 288, 612, 323, 684, 360, 760, 399, 840, 440, 924, 483, 1012, 528, 1104, 575, 1200, 624, 1300, 675, 1404, 728, 1512, 783
(list; graph; listen)
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OFFSET
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3,1
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FORMULA
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a(n)=2*A055522(n)/n=sqrt(A055524(n)^2-n^2)
a(2k)=(k-1)*(k+1), a(2k+1)=2k*(k+1)
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CROSSREFS
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Cf. A009112, A046079, A046080, A046081, A054435, A054436, A055522, A055524, A055525, A055526, A055527.
Sequence in context: A106285 A061727 A055527 this_sequence A074324 A162766 A166552
Adjacent sequences: A055520 A055521 A055522 this_sequence A055524 A055525 A055526
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KEYWORD
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nonn
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AUTHOR
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Henry Bottomley (se16(AT)btinternet.com), May 22 2000
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