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A052459
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a(n) = n*(2*n^2+1)*(n^2+1)/6.
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3
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1, 15, 95, 374, 1105, 2701, 5775, 11180, 20049, 33835, 54351, 83810, 124865, 180649, 254815, 351576, 475745, 632775, 828799, 1070670, 1366001, 1723205, 2151535, 2661124, 3263025, 3969251, 4792815, 5747770, 6849249, 8113505
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OFFSET
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1,2
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COMMENTS
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2-magic series constant.
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LINKS
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Table of n, a(n) for n=1..30.
Eric Weisstein's World of Mathematics, Magic constant.
Index to sequences with linear recurrences with constant coefficients, signature (6,-15,20,-15,6,-1).
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CROSSREFS
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Cf. A052460, A052461.
Sequence in context: A114240 A189657 A190274 * A044266 A044647 A159528
Adjacent sequences: A052456 A052457 A052458 * A052460 A052461 A052462
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KEYWORD
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nonn,easy,changed
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AUTHOR
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Eric W. Weisstein
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EXTENSIONS
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Formula from Vladeta Jovovic, Jun 15 2002
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STATUS
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approved
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