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 A052459 a(n) = n*(2*n^2+1)*(n^2+1)/6. 3
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 2-magic series constant. LINKS Eric Weisstein's World of Mathematics, Magic constant. Index to sequences with linear recurrences with constant coefficients, signature (6,-15,20,-15,6,-1). CROSSREFS Cf. A052460, A052461. Sequence in context: A114240 A189657 A190274 * A044266 A044647 A232296 Adjacent sequences:  A052456 A052457 A052458 * A052460 A052461 A052462 KEYWORD nonn,easy AUTHOR EXTENSIONS Formula from Vladeta Jovovic, Jun 15 2002 STATUS approved

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