OFFSET
0,2
LINKS
FORMULA
a(n) = (11^(n+1) - 7^(n+1))/4. - Al Hakanson (hawkuu(AT)gmail.com), Dec 31 2008; adapted to offset by Michel Marcus, Mar 09 2025
a(n) = 18*a(n-1) - 77*a(n-2). - Philippe Deléham, Jan 01 2009
a(n) = 11*a(n-1) + 7^n, a(0)=1. - Vincenzo Librandi, Feb 09 2011
From Elmo R. Oliveira, Mar 09 2025: (Start)
E.g.f.: exp(7*x)*(11*exp(4*x) - 7)/4.
a(n) = A139745(n+1)/4. (End)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved