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A199316
11*5^n+1.
1
12, 56, 276, 1376, 6876, 34376, 171876, 859376, 4296876, 21484376, 107421876, 537109376, 2685546876, 13427734376, 67138671876, 335693359376, 1678466796876, 8392333984376, 41961669921876, 209808349609376, 1049041748046876
OFFSET
0,1
FORMULA
a(n) = 5*a(n-1)-4.
a(n) = 6*a(n-1)-5*a(n-2).
G.f.: 4*(3-4*x)/((1-x)*(1-5*x)).
MATHEMATICA
LinearRecurrence[{6, -5}, {12, 56}, 30] (* Harvey P. Dale, Aug 03 2014 *)
PROG
(Magma) [11*5^n+1: n in [0..30]];
CROSSREFS
Sequence in context: A009827 A068418 A068414 * A081756 A307741 A027147
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 05 2011
STATUS
approved