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A255490
The subsequence A247649(2^n-1).
1
1, 5, 7, 19, 25, 77, 103, 307, 409, 1229, 1639, 4915, 6553, 19661, 26215, 78643, 104857, 314573, 419431, 1258291, 1677721, 5033165, 6710887, 20132659, 26843545, 80530637, 107374183, 322122547, 429496729, 1288490189, 1717986919, 5153960755
OFFSET
0,2
COMMENTS
Note that A247649 is not the Run Length Transform of this sequence - compare A253085.
FORMULA
G.f.: (1+5*x+4*x^2+4*x^3)/(1-3*x^2-4*x^4).
MATHEMATICA
LinearRecurrence[{0, 3, 0, 4}, {1, 5, 7, 19}, 40] (* Georg Fischer, Aug 18 2021 *)
CROSSREFS
Sequence in context: A076787 A332763 A094963 * A045446 A106074 A128335
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Mar 03 2015
STATUS
approved