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A199313
9*5^n+1.
1
10, 46, 226, 1126, 5626, 28126, 140626, 703126, 3515626, 17578126, 87890626, 439453126, 2197265626, 10986328126, 54931640626, 274658203126, 1373291015626, 6866455078126, 34332275390626, 171661376953126, 858306884765626
OFFSET
0,1
FORMULA
a(n) = 5*a(n-1)-4.
a(n) = 6*a(n-1)-5*a(n-2).
G.f.: 2*(5-7*x)/((1-x)*(1-5*x)).
PROG
(Magma) [9*5^n+1: n in [0..30]];
CROSSREFS
Sequence in context: A287090 A183133 A115712 * A003765 A138041 A351901
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 05 2011
STATUS
approved