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 A271908 #20 Feb 20 2017 12:11:36 %S A271908 0,1,9,37,111,266,550,1006,1744,2821,4349,6405,9203,12804,17418,23164, %T A271908 30348,39023,49591,62073,76997,94454,114768,138054,165176,196019, %U A271908 231085,270557,315283,365102,421116,482950,552092,628401,712437,804509,906217,1016724,1137140,1267836,1410790,1564903 %N A271908 a(n) = A186434(n)/4. %C A271908 It would be nice to have a formula. %H A271908 Lars Blomberg, <a href="/A271908/b271908.txt">Table of n, a(n) for n = 1..10000</a> %Y A271908 Cf. A186434. %K A271908 nonn %O A271908 1,3 %A A271908 _N. J. A. Sloane_, Apr 22 2016