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Search: id:A070260
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| 3, 2, 15, 6, 35, 12, 63, 20, 99, 30, 143, 42, 195, 56, 255, 72, 323, 90, 399, 110, 483, 132, 575, 156, 675, 182, 783, 210, 899, 240, 1023, 272, 1155, 306, 1295, 342, 1443, 380, 1599, 420, 1763, 462, 1935, 506, 2115, 552, 2303, 600, 2499, 650, 2703, 702
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OFFSET
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1,1
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FORMULA
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n*(n+2)/4 if n is even else n*(n+2). Recurrence: a(n) = 3*a(n-2)-3*a(n-4)+a(n-6). G.f.: x*(3+2*x+6*x^2-x^4)/(1-x^2)^3. - Vladeta Jovovic (vladeta(AT)eunet.rs), May 09 2002
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MATHEMATICA
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Table[ LCM[i + 2, i] / GCD[i + 2, i], {i, 1, 60}]
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CROSSREFS
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Bisections: A002378, A000466.
Sequence in context: A086485 A068310 A033314 this_sequence A142705 A072346 A103236
Adjacent sequences: A070257 A070258 A070259 this_sequence A070261 A070262 A070263
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 09 2002
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EXTENSIONS
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More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), May 09 2002
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