0,2

The initial terms coincide with those of A170739, although the two sequences are eventually different.

First disagreement at index 28: a(28) = 672012298869208966454321386225202590, A170739(28) = 672012298869208966454321386225202780. - Klaus Brockhaus, May 24 2011

Computed with Magma using commands similar to those used to compute A154638.

Index entries for linear recurrences with constant coefficients, signature (18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, -171).

G.f.: (t^28 + 2*t^27 + 2*t^26 + 2*t^25 + 2*t^24 + 2*t^23 + 2*t^22 + 2*t^21 + 2*t^20 + 2*t^19 + 2*t^18 + 2*t^17 + 2*t^16 + 2*t^15 + 2*t^14 + 2*t^13 + 2*t^12 + 2*t^11 + 2*t^10 + 2*t^9 + 2*t^8 + 2*t^7 + 2*t^6 + 2*t^5 + 2*t^4 + 2*t^3 + 2*t^2 + 2*t + 1)/(171*t^28 - 18*t^27 - 18*t^26 - 18*t^25 - 18*t^24 - 18*t^23 - 18*t^22 - 18*t^21 - 18*t^20 - 18*t^19 - 18*t^18 - 18*t^17 - 18*t^16 - 18*t^15 - 18*t^14 - 18*t^13 - 18*t^12 - 18*t^11 - 18*t^10 - 18*t^9 - 18*t^8 - 18*t^7 - 18*t^6 - 18*t^5 - 18*t^4 - 18*t^3 - 18*t^2 - 18*t + 1).

coxG[{28, 171, -18}] (* The coxG program is at A169452 *) (* Harvey P. Dale, Apr 06 2022 *)

Cf. A170739 (G.f.: (1+x)/(1-19*x)).

Sequence in context: A169081 A169129 A169177 * A169273 A169321 A169465

Adjacent sequences: A169222 A169223 A169224 * A169226 A169227 A169228

John Cannon and N. J. A. Sloane, Dec 03 2009

approved