A255490 The subsequence A247649(2^n-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

Author

N. J. A. Sloane, Mar 03 2015

Keywords

• nonn
• easy

Comments

Note that A247649 is not the Run Length Transform of this sequence - compare A253085.

Links

• Index entries for linear recurrences with constant coefficients, signature (0,3,0,4)

Crossrefs

Cf. A247649, A253085.

Programs

Mathematica

LinearRecurrence[{0,3,0,4}, {1,5,7,19}, 40] (* Georg Fischer, Aug 18 2021 *)

Formula

G.f.: (1+5*x+4*x^2+4*x^3)/(1-3*x^2-4*x^4).