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0, 256, 3584, 21504, 84480, 256256, 652288, 1462272, 2976768, 5617920, 9974272, 16839680, 27256320, 42561792, 64440320, 94978048, 136722432, 192745728, 266712576, 362951680, 486531584, 643340544, 840170496, 1084805120, 1386112000, 1754138880, 2200214016
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listen;
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) = (64*(n^2-5*n^4+4*n^6))/45. - Colin Barker, Jun 29 2015
G.f.: -256*x^2*(x+1)*(x^2+6*x+1) / (x-1)^7. - Colin Barker, Jun 29 2015
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EXAMPLE
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n=3: 3584 = 6*1414 - 70^2.
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MATHEMATICA
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LinearRecurrence[{7, -21, 35, -35, 21, -7, 1}, {0, 256, 3584, 21504, 84480, 256256, 652288}, 40] (* Harvey P. Dale, Mar 01 2020 *)
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PROG
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(PARI) concat(0, Vec(-256*x^2*(x+1)*(x^2+6*x+1)/(x-1)^7 + O(x^100))) \\ Colin Barker, Jun 29 2015
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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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STATUS
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approved
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