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(MAGMAMagma) [n^2*(n^2 + 1)/2: n in [0..30]] // Stefano Spezia, Jan 15 2019
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Th. Gruner, A. Kerber, R. Laue, and M. Meringer, <a href="https://doi.org/10.1007/978-3-642-60185-9_7">Mathematics for Combinatorial Chemistry</a>, In: F. Keil, W. Mackens, H. Voß and J. Wether, Scientific Computing in Chemical Engineering II, Springer, 1999, 74-81.
<a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (5, -10, 10, -5, 1).
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Sum_{n>=1} (-1)^(n+1)/a(n) = Pi*csch(Pi) + Pi^2/6 - 1. - Amiram Eldar, Nov 02 2021
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0, 1, 10, 45, 136, 325, 666, 1225, 2080, 3321, 5050, 7381, 10440, 14365, 19306, 25425, 32896, 41905, 52650, 65341, 80200, 97461, 117370, 140185, 166176, 195625, 228826, 266085, 307720, 354061, 405450, 462241, 524800, 593505, 668746, 750925, 840456, 937765
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