you might have referenced http://oeis.org/A001110 and A001109! Best regards Neil Neil J. A. Sloane, President, OEIS Foundation. 11 South Adelaide Avenue, Highland Park, NJ 08904, USA. Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ. Phone: 732 828 6098; home page: http://NeilSloane.com Email: njasloane@gmail.com On Sun, Dec 7, 2014 at 11:01 PM, Bill Gosper <billgosper@gmail.com> wrote:

Something for the youngsters: gosper.org/triangsq.pdf But you might see a Mathematica trick, e.g. --rwg _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun