login
A199312
(9*5^n+1)/2.
1
5, 23, 113, 563, 2813, 14063, 70313, 351563, 1757813, 8789063, 43945313, 219726563, 1098632813, 5493164063, 27465820313, 137329101563, 686645507813, 3433227539063, 17166137695313, 85830688476563, 429153442382813, 2145767211914063
OFFSET
0,1
FORMULA
a(n) = 5*a(n-1)-2.
a(n) = 6*a(n-1)-5*a(n-2).
G.f.: (5-7*x)/((1-x)*(1-5*x)).
PROG
(Magma) [(9*5^n+1)/2: n in [0..30]];
CROSSREFS
Sequence in context: A360100 A178873 A186652 * A320326 A299589 A113284
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 05 2011
STATUS
approved