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 A347320 #5 Jun 23 2025 22:35:40 %S A347320 0,4,42,176,540,1152,2534,4608,6984,12580,19250,26016,39988,55076, %T A347320 63570,97920,127024,155088,203946,253360,289044,378884,456918,528672, %U A347320 648200,763620,869022,1040368,1204196,1318440,1588750,1812224,2013132,2329476,2626330,2910672,3303804,3687748,4039854,4555520,5043000,5471088,6133778,6740976,7295760,8090020,8836094,9544128,10481296,11384900 %N A347320 A344857(2*n). %C A347320 No formula is known. %Y A347320 Cf. A344857, A344866. %K A347320 nonn,more %O A347320 1,2 %A A347320 _Scott R. Shannon_ and _N. J. A. Sloane_, Sep 12 2021, extended Jun 23 2025