OFFSET
1,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..200
FORMULA
a(n) = 120^n - (7*n + 1)*36^n + binomial(7*n+1, 2)*8^n - binomial(7*n+1, 3). - Andrew Howroyd, May 07 2020
PROG
(PARI) a(n) = {120^n - (7*n + 1)*36^n + binomial(7*n+1, 2)*8^n - binomial(7*n+1, 3)} \\ Andrew Howroyd, May 07 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 29 2009
EXTENSIONS
Terms a(7) and beyond from Andrew Howroyd, May 07 2020
STATUS
approved