A181658 Row sums of A181657.

1, 2, 3, 7, 8, 19, 20, 48, 49, 118, 119, 287, 288, 695, 696, 1680, 1681, 4058, 4059, 9799, 9800, 23659, 23660, 57120, 57121, 137902, 137903, 332927, 332928, 803759, 803760, 1940448, 1940449, 4684658, 4684659, 11309767, 11309768, 27304195, 27304196

Offset

0,2

Links

Table of n, a(n) for n=0..38.

Index entries for linear recurrences with constant coefficients, signature (0,3,0,-1,0,-1)

Formula

G.f.: (1+2x+x^3)/(1-3x^2+x^4+x^6)=(1+2x+x^3)/((1-x^2)(1-2x^2-x^4)).

Mathematica

CoefficientList[Series[(1+2x+x^3)/(1-3x^2+x^4+x^6), {x, 0, 40}], x] (* or *) LinearRecurrence[{0, 3, 0, -1, 0, -1}, {1, 2, 3, 7, 8, 19}, 40] (* Harvey P. Dale, Mar 29 2022 *)

Crossrefs

Cf. A048739 (bisection).

Sequence in context: A002964 A166966 A247843 * A251541 A325105 A276032

Adjacent sequences: A181655 A181656 A181657 * A181659 A181660 A181661

Keyword

easy,nonn

Author

Paul Barry, Nov 03 2010

Status

approved