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Table of n, a(n) for n=1..27.
United States Postal Service, Rate History - Domestic Rates.
a(1)=6 since the first uniform letter rate (in 1863) was 3 cents per 1/2 ounce.
a(2)=4 since this rate was reduced to 2 cents per 1/2 ounce in 1883.
a(3)=2 since a per ounce price of 2 cents was instituted in 1885.
See A097618 for another version.
Sequence in context: A134300 A226655 A199741 * A114062 A028975 A145011
Adjacent sequences: A125211 A125212 A125213 * A125215 A125216 A125217
Jason G. Wurtzel, Nov 24 2006
Added terms a(20)-a(26) Jason G. Wurtzel, Jul 19 2010