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 A123064 #9 Sep 08 2022 08:45:28 %S A123064 0,2,4,5,7,8,10,14,16,18,19,20,25,28,32,35,36,38,40,41,45,49,50,56,59, %T A123064 62,63,64,70,71,72,76,80,82,90,94,95,97,98,100,101,103,107,109,112, %U A123064 113,118,124,125,126,128,133,134,140,142,144,152,155,157,160,162,163,164,171,175 %N A123064 Numbers represented by the quadratic form 2 x^2 + xy + 4 y^2. %D A123064 J. H. Conway, The Sensual (Quadratic) Form, M.A.A., 1997, p. 82. %H A123064 N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references) %o A123064 (Magma) L:=LatticeWithGram(2, [4,1,1,8] ); T<q> := ThetaSeries(L,500); T; %Y A123064 Cf. A123063, A123065, A123067, A123068. %Y A123064 Primes: A106872. %K A123064 nonn %O A123064 1,2 %A A123064 _N. J. A. Sloane_, Sep 27 2006