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 A114139 #20 Jun 05 2019 10:57:28 %S A114139 -2,-2,1,-1,1,1,1,1,2,2,0,3,2,3,2,2,3,4,3,3,1,1,3,2 %N A114139 Changes in United States postal rates per ounce since 1863. %C A114139 Benjamin Franklin, first Postmaster General of the United States, applied computational complexity theory to Economics by changing the business plan for American mail by changing from payment by distance to payment by weight. "Before stamps were used a person had to collect his mail at the post office and pay for it. Franklin stopped the money loss on unclaimed mail in Philadelphia by printing in his paper the names of persons who had mail awaiting them. He also developed a simple, accurate way of keeping post-office accounts. In 1753 Franklin was made deputy postmaster general for all the colonies." [Encyclopedia Britannica] %D A114139 R. K. Guy, Unsolved Problems in Number Theory, C12. %H A114139 R. Alter and J. A. Barnett, <a href="https://www.jstor.org/stable/2321610">A postage stamp problem</a>, Amer. Math. Monthly, Vol. 87, No. 3 (1980), 206-210. %H A114139 A. K. Dart, <a href="http://www.akdart.com/postrate.html">The History of Postage Rates in the United States</a> %H A114139 W. F. Lunnon, <a href="https://doi.org/10.1093/comjnl/12.4.377">A postage stamp problem</a>, Comput. J., Vol. 12, No. 4 (1969) 377-380. %H A114139 USPS, <a href="https://about.usps.com/postal-bulletin/2006/html/pb22176/kit.html">Benjamin Franklin Commemorative Stamps</a> %H A114139 1847usa.com, <a href="http://www.1847usa.com/USPostageByYear.htm">United States Postage Stamps By Year</a>. %e A114139 a(1) = -2 because the rate per half ounce was lowered effective 3 March 1863 from 3 cents to 2 cents; thereafter rates were per ounce. %Y A114139 First differences of A114062. %Y A114139 Cf. A001212, A001213, A014616, A001208, A001209, A001210, A001211, A001212, A001213, A001214, A001215, A001216, A005342, A005343, A005344, A014616, A053346, A053348, A075060, A084192, A084193. %K A114139 easy,fini,sign %O A114139 1,1 %A A114139 _Jonathan Vos Post_, Feb 03 2006