%N Distribution of letters in the name of all months of the year (English).
%C Each of the 26 letters of the (English) alphabet, encoded via a->1, b->2, ... , z->26, appears a(n) times in the string of all the (English) names of the twelve months of the year. The letters are taken case insensitive.
%F a(n) = number of times the letter with standard code n (for the code see a comment above), appears in all the twelve English names for the months of the year.
%e a(1) = 7 because the first letter 'a' (or 'A') of the English alphabet appears in 'January' twice, in 'February' once, in 'March' once, in 'April' once, in 'May' once and once in 'August'.
%e a(5) = 11 = 0 + 1 + 0 + 0 + 0 + 1 + 0 + 0 + 3 + 1 + 2 + 3.
%e a(11) = 0 because there is no 'k' or 'K' in the name of the months in English.
%Y Cf. A219241 (analog for days of the week).
%A _Wolfdieter Lang_, Dec 14 2012