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 A100162 #19 Aug 06 2025 09:26:31 %S A100162 1,26,117,316,665,1206,1981,3032,4401,6130,8261,10836,13897,17486, %T A100162 21645,26416,31841,37962,44821,52460,60921,70246,80477,91656,103825, %U A100162 117026,131301,146692,163241,180990,199981,220256 %N A100162 Structured disdyakis dodecahedral numbers (vertex structure 7). %C A100162 Also structured deltoidal icositetrahedral numbers (vertex structure 7) (cf. A100161 = alternate vertex). %H A100162 Vincenzo Librandi, <a href="/A100162/b100162.txt">Table of n, a(n) for n = 1..5000</a> %H A100162 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (4,-6,4,-1). %F A100162 a(n) = (1/6)*(42*n^3 - 54*n^2 + 18*n). %F A100162 G.f.: x*(1 + 22*x + 19*x^2)/(1-x)^4. - _Colin Barker_, Jan 19 2012 %o A100162 (Magma) [(1/6)*(42*n^3-54*n^2+18*n): n in [1..40]]; // _Vincenzo Librandi_, Jul 24 2011 %Y A100162 Cf. A100161, A100163 = alternate vertices; A100145 for more on structured polyhedral numbers. %Y A100162 Cf. A260260 (comment). - _Bruno Berselli_, Jul 22 2015 %K A100162 nonn,easy %O A100162 1,2 %A A100162 James A. Record (james.record(AT)gmail.com), Nov 07 2004