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 A101869 #10 Mar 20 2024 09:35:28 %S A101869 10,20,26,36,46,52,62,68,78,88,94,104,114,120,130,136,146,156,162,172, %T A101869 178,188,198,204,214,224,230,240,246,256,266,272,282,292,298,308,314, %U A101869 324,334,340,350,356,366,376,382,392,402,408,418,424,434,444,450,460,466,476,486 %N A101869 Row 2 of A101866. %H A101869 Paolo Xausa, <a href="/A101869/b101869.txt">Table of n, a(n) for n = 1..10000</a> %F A101869 a(n) = 2*n + 4*ceiling(n*(1 + sqrt(5))/2). - _Paolo Xausa_, Mar 20 2024 %t A101869 Array[2*# + 4*Ceiling[#*GoldenRatio] &, 100] (* _Paolo Xausa_, Mar 20 2024 *) %Y A101869 Cf. A001622, A101866. %K A101869 nonn %O A101869 1,1 %A A101869 _N. J. A. Sloane_, Jan 28 2005