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A199418 3*7^n+1. 1
4, 22, 148, 1030, 7204, 50422, 352948, 2470630, 17294404, 121060822, 847425748, 5931980230, 41523861604, 290667031222, 2034669218548, 14242684529830, 99698791708804, 697891541961622, 4885240793731348, 34196685556119430 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
FORMULA
a(n) = 7*a(n-1)-6.
a(n) = 8*a(n-1)-7*a(n-2).
G.f.: 2*(2-5*x)/((1-x)*(1-7*x)).
MATHEMATICA
LinearRecurrence[{8, -7}, {4, 22}, 20] (* Harvey P. Dale, Dec 29 2018 *)
PROG
(Magma) [3*7^n+1: n in [0..30]];
CROSSREFS
Sequence in context: A278396 A121394 A005039 * A112898 A253095 A111529
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 06 2011
STATUS
approved

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Last modified December 7 04:15 EST 2023. Contains 367629 sequences. (Running on oeis4.)