OFFSET
1,5
COMMENTS
This sequence has some elements in common with A018112 (-> elements 1, 2, 5, 11, 23, 50, 110).
The sum of the reciprocals of a(n) (for n>=2) converges to 2.870623225848376377857...
FORMULA
a(n) = floor(sinh(n)/(n^2)), for n >= 1.
MATHEMATICA
Table[Floor[Sinh[n]/n^2], {n, 30}] (* Harvey P. Dale, Nov 15 2018 *)
PROG
(PARI) a(n)=localprec(19); localprec((n-log(2))\log(10)+9); sinh(n)\n^2 \\ Charles R Greathouse IV, Nov 10 2016
CROSSREFS
KEYWORD
AUTHOR
Alessandro Polcini, Nov 10 2016
STATUS
approved