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A198845
8*6^n-1.
1
7, 47, 287, 1727, 10367, 62207, 373247, 2239487, 13436927, 80621567, 483729407, 2902376447, 17414258687, 104485552127, 626913312767, 3761479876607, 22568879259647, 135413275557887, 812479653347327, 4874877920083967, 29249267520503807
OFFSET
0,1
FORMULA
a(n) = 6*a(n-1)+5. a(n) = 7*a(n-1)-6*a(n-2), n>1.
PROG
(Magma) [8*6^n-1: n in [0..30]]
CROSSREFS
Sequence in context: A269520 A009260 A201871 * A323131 A229010 A126635
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Oct 31 2011
STATUS
approved