OFFSET
3,4
LINKS
Michel Marcus, Table of n, a(n) for n = 3..10000
EXAMPLE
PROG
(PARI) row(n)=my(v=List()); fordiv(2*n, k, if(k<2, next); if(k==n, break); my(s=(2*n/k-4+2*k)/(k-1)); if(denominator(s)==1, listput(v, s))); Vec(v); \\ A177028
a(n) = vecprod(row(n))/n;
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Marcus, Mar 22 2021
STATUS
approved