OFFSET
0,2
REFERENCES
Richard A. Mollin, Codes: The Guide to Secrecy From Ancient to Modern Times. Chapman and Hall/CRC (2005): 12.
Anne L. Young, Mathematical Ciphers: From Caesar to RSA. American Mathematical Society (2006): 23.
LINKS
FORMULA
a(n) = 26*n = 2*a(n-1) - a(n-2).
G.f.: 26*x/(1-x)^2. - Georg Fischer, Feb 25 2019
MATHEMATICA
26 Range[0, 51]
PROG
(PARI) a(n)=26*n \\ Georg Fischer, Feb 25 2019
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alonso del Arte, Dec 25 2014
STATUS
approved