OFFSET
1,2
COMMENTS
a(n) == 1 mod 9.
a(n)/a(n-1) tends to 4.54138126... = (3 + sqrt(37))/2
LINKS
FORMULA
a(1) = 1, a(2) = 10, a(n), n>2 = 3*a(n-1) + 7*a(n-2). a(n) = upper left term in [1,3; 3,2]^n
EXAMPLE
a(4) = 181 = 3*a(3) + 7*a(2) = 3*37 + 7*10.
a(4) = 181 = upper left term in [1,3; 3,2]^4.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Gary W. Adamson, Mar 14 2008
STATUS
approved