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A083200
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Polynexus numbers of order 7.
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9
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0, 1, 17, 118, 514, 1681, 4529, 10612, 22380, 43473, 79057, 136202, 224302, 355537, 545377, 813128, 1182520, 1682337, 2347089, 3217726, 4342394, 5777233, 7587217, 9847036, 12642020, 16069105, 20237841, 25271442, 31307878, 38501009, 47021761
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OFFSET
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1,3
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LINKS
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FORMULA
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a(n) = ((n^7-(n-1)^7)-(n^3-(n-1)^3))/120.
G.f.: x^2*(1+10*x+20*x^2+10*x^3+x^4)/(1-x)^7. - Bruno Berselli, Feb 13 2012
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MATHEMATICA
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Table[((n^7 - (n - 1)^7) - (n^3 - (n - 1)^3))/120, {n, 31}] (* Bruno Berselli, Feb 13 2012 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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Xavier Acloque, Jun 01 2003
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EXTENSIONS
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Offset changed (according to the formula) from Bruno Berselli, Feb 13 2012
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STATUS
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approved
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