%I A003556
%S A003556 0,1,4,19600
%N A003556 Both square and tetrahedral.
%D A003556 D. Wells, The Penguin Dictionary of Curious and Interesting Numbers. 
               Penguin Books, NY, 1986, 600.
%D A003556 D. Wells, The Penguin Dictionary of Curious and Interesting Numbers, 
               p. 165 (Rev. ed. 1997).
%t A003556 Select[Rest[FoldList[Plus, 0, Rest[FoldList[Plus, 0, Range[50000]]]]], 
               IntegerQ[Sqrt[ # ]]&]
%Y A003556 Sequence in context: A003832 A162703 A070157 this_sequence A053015 A089210 
               A034014
%Y A003556 Adjacent sequences: A003553 A003554 A003555 this_sequence A003557 A003558 
               A003559
%K A003556 nonn,fini,full,bref
%O A003556 1,3
%A A003556 N. J. A. Sloane (njas(AT)research.att.com).