OFFSET
0,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..20000
F. T. Adams-Watters, Re: Set of sets using minimal number of braces, SeqFan Oct 29 2011
J. Zucker, Set of sets using minimal number of braces, SeqFan Oct 25 2011
MAPLE
# implementing the Adams-Watters partial sum formula up to nmax elements
read("transforms") ;
nmax := 40 ;
a004111rep := [1, 1] ;
n := 2 ;
while nops(a004111rep) < nmax do
a004111rep := [op(a004111rep), seq(n, i=1..A004111(n))] ;
n := n+1 ;
end do:
PSUM(a004111rep) ;
CROSSREFS
KEYWORD
nonn
AUTHOR
R. J. Mathar, Oct 29 2011
STATUS
approved