0,2

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

First disagreement at index 21: a(21) = 751799469150919163867111830, A170739(21) = 751799469150919163867112020. - Klaus Brockhaus, Apr 05 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, -171).

G.f.: (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^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).

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

Sequence in context: A168745 A168793 A168841 * A168937 A168985 A169033

Adjacent sequences: A168886 A168887 A168888 * A168890 A168891 A168892

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

approved