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

0,2

Comments

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

Links

Table of n, a(n) for n=0..31.

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

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

Cf. A247649, A253085.

Sequence in context: A076787 A332763 A094963 * A045446 A106074 A128335

Adjacent sequences: A255487 A255488 A255489 * A255491 A255492 A255493

Keyword

nonn,easy

Author

N. J. A. Sloane, Mar 03 2015

Status

approved