OFFSET
1,2
REFERENCES
Dan Hoey, Bill Gosper and Richard C. Schroeppel, Discussions in Math-Fun Mailing list, circa Jul 13 1999.
LINKS
Jean-François Alcover, Table of n, a(n) for n = 1..32
R. C. Schroeppel, A few mathematical experiments, Experimental Mathematics Workshop, Oakland, 2004.
FORMULA
a(n) = n * A001420(n) / 2. - Andrew Howroyd, Dec 04 2018
MATHEMATICA
a[n_] := n * A001420[[n]] / 2;
Array[a, 27] (* Jean-François Alcover, Sep 08 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, May 07 2004
STATUS
approved