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A015238
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a(n) = (2*n - 3)n^2.
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3
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0, -1, 4, 27, 80, 175, 324, 539, 832, 1215, 1700, 2299, 3024, 3887, 4900, 6075, 7424, 8959, 10692, 12635, 14800, 17199, 19844, 22747, 25920, 29375, 33124, 37179, 41552, 46255, 51300, 56699, 62464, 68607
(list;
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listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4).
E.g.f.: (-x + 3*x^2 + 2*x^3)*exp(x). (End)
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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