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 A291088 #7 Sep 01 2017 23:50:21 %S A291088 1,2,8,38,196,1052,5774,32146,180772,1024256,5837908,33433996, %T A291088 192239854,1109049320,6416509142,37215072638,216309089956, %U A291088 1259663964184,7347943049432,42926944354480,251119894730596,1470830479288432,8624336421678788,50620679934081988 %N A291088 a(n) = A026520(2n). %H A291088 Lars Blomberg, <a href="/A291088/b291088.txt">Table of n, a(n) for n = 0..500</a> %Y A291088 Cf. A026520, A291089. %K A291088 nonn %O A291088 0,2 %A A291088 _N. J. A. Sloane_, Aug 19 2017 %E A291088 a(15)-a(23) from _Lars Blomberg_, Sep 01 2017