OFFSET
1,1
COMMENTS
Column 6 of A206455.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
Index entries for linear recurrences with constant coefficients, signature (7,0,0,0,0,0,-1).
FORMULA
a(n) = 7*a(n-1) - a(n-7).
Empirical: a(n) = Sum_{i=0..floor(n/7)} ((-1)^i*7^(n-7*i)*binomial(n-6*i,i)).
g.f.: x*(7 - x^6) / (1 - 7*x + x^7). - Colin Barker, Jun 16 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 07 2012
STATUS
approved