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%I #20 Jun 05 2019 10:57:28
%S -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 Changes in United States postal rates per ounce since 1863.
%C 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 R. K. Guy, Unsolved Problems in Number Theory, C12.
%H 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 A. K. Dart, <a href="http://www.akdart.com/postrate.html">The History of Postage Rates in the United States</a>
%H 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 USPS, <a href="https://about.usps.com/postal-bulletin/2006/html/pb22176/kit.html">Benjamin Franklin Commemorative Stamps</a>
%H 1847usa.com, <a href="http://www.1847usa.com/USPostageByYear.htm">United States Postage Stamps By Year</a>.
%e 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 First differences of A114062.
%Y Cf. A001212, A001213, A014616, A001208, A001209, A001210, A001211, A001212, A001213, A001214, A001215, A001216, A005342, A005343, A005344, A014616, A053346, A053348, A075060, A084192, A084193.
%K easy,fini,sign
%O 1,1
%A _Jonathan Vos Post_, Feb 03 2006
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