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 A100159 #17 Aug 06 2025 09:25:46 %S A100159 1,62,297,820,1745,3186,5257,8072,11745,16390,22121,29052,37297,46970, %T A100159 58185,71056,85697,102222,120745,141380,164241,189442,217097,247320, %U A100159 280225,315926,354537,396172,440945,488970,540361,595232 %N A100159 Structured disdyakis triacontahedral numbers (vertex structure 7). %C A100159 Also structured deltoidal hexacontahedral numbers (vertex structure 7) (cf. A100158, A100166 = alternate vertices). %H A100159 Vincenzo Librandi, <a href="/A100159/b100159.txt">Table of n, a(n) for n = 1..5000</a> %H A100159 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (4,-6,4,-1). %F A100159 a(n) = (1/6)*(114*n^3 - 162*n^2 + 54*n) = n*(19*n^2 - 27*n + 9). %F A100159 G.f.: x*(1 + 58*x + 55*x^2)/(1-x)^4. [_Colin Barker_, Apr 16 2012] %o A100159 (Magma) [(1/6)*(114*n^3-162*n^2+54*n): n in [1..40]]; // _Vincenzo Librandi_, Jul 19 2011 %Y A100159 Cf. A100158, A100160 = alternate vertices; A100145 for more on structured polyhedral numbers. %K A100159 nonn,easy %O A100159 1,2 %A A100159 James A. Record (james.record(AT)gmail.com), Nov 07 2004