This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A100185 #16 Sep 08 2022 08:45:15 %S A100185 1,4,19,68,185,416,819,1464,2433,3820,5731,8284,11609,15848,21155, %T A100185 27696,35649,45204,56563,69940,85561,103664,124499,148328,175425, %U A100185 206076,240579,279244,322393,370360,423491,482144 %N A100185 Structured meta-anti-prism numbers, the n-th number from a structured n-gonal anti-prism number sequence. %H A100185 Vincenzo Librandi, <a href="/A100185/b100185.txt">Table of n, a(n) for n = 1..10000</a> %H A100185 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (5,-10,10,-5,1). %F A100185 a(n) = (1/6)*(3*n^4 - 8*n^3 + 9*n^2 + 2*n). %F A100185 G.f.: x*(1 - x + 9*x^2 + 3*x^3)/(1-x)^5. [_Colin Barker_, Jun 08 2012] %e A100185 There are no 1- or 2-gonal anti-prisms, so 1 and (2n) are used as the first and second terms since all the sequences begin as such. %o A100185 (Magma) [(1/6)*(3*n^4-8*n^3+9*n^2+2*n): n in [1..40]]; // _Vincenzo Librandi_, Aug 03 2011 %Y A100185 Cf. A005900, A000447, A096000, A100178, A100157, A100185 - structured anti-prisms; A006484 for other structured meta numbers; and A100145 for more on structured numbers. %K A100185 easy,nonn %O A100185 1,2 %A A100185 James A. Record (james.record(AT)gmail.com)