A350967 a(n) = sqrt(84*A144930(n)^2 - 3).

9, 999, 109881, 12085911, 1329340329, 146215350279, 16082359190361, 1768913295589431, 194564380155647049, 21400312903825585959, 2353839855040658808441, 258900983741568643342551, 28476754371717510108872169, 3132184079905184543332596039, 344511772035198582256476692121

Offset

1,1

References

E.-A. Majol, Note #2228, L'Intermédiaire des Mathématiciens, 9 (1902), pp. 183-185.

Links

Table of n, a(n) for n=1..15.

Index entries for linear recurrences with constant coefficients, signature (110,-1).

Formula

G.f.: 9*x*(1+x)/(1-110*x+x^2) . - R. J. Mathar, Mar 07 2022

a(n) = 9*A298677(n-1). - R. J. Mathar, Mar 07 2022

Crossrefs

Cf. A144930.

Sequence in context: A083909 A307324 A327435 * A100601 A260029 A266321

Adjacent sequences: A350964 A350965 A350966 * A350968 A350969 A350970

Keyword

nonn

Author

N. J. A. Sloane, Mar 03 2022

Status

approved