%I A001801 M3001 N1216
%S A001801 3,15,105,315,6930,18018,90090,218790,2078505,4849845,22309287,
%T A001801 50702925,1825305300,4071834900,18032411700,39671305740,347123925225,
%U A001801 755505013725,3273855059475,7064634602025,121511715154830
%N A001801 Coefficients of Legendre polynomials.
%D A001801 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A001801 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A001801 M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, 
               National Bureau of Standards Applied Math. Series 55, 1964 (and various 
               reprintings), p. 798.
%D A001801 G. Pr\'{e}vost, Tables de Fonctions Sph\'{e}riques. Gauthier-Villars, 
               Paris, 1933, pp. 156-157.
%H A001801 M. Abramowitz and I. A. Stegun, eds., <a href="http://www.nrbook.com/
               abramowitz_and_stegun/">Handbook of Mathematical Functions</a>, National 
               Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 
               [alternative scanned copy].
%o A001801 (PARI) a(n)=if(n<0,0,polcoeff(pollegendre(n+4),n)*2^valuation((n\2*2+4)!,
               2))
%Y A001801 Cf. A001790, A001800, A008316.
%Y A001801 Bisection of A004733.
%Y A001801 Diagonal 3 of triangle A100258.
%Y A001801 Sequence in context: A145624 A025547 A088989 this_sequence A067546 A015682 
               A001147
%Y A001801 Adjacent sequences: A001798 A001799 A001800 this_sequence A001802 A001803 
               A001804
%K A001801 nonn
%O A001801 0,1
%A A001801 N. J. A. Sloane (njas(AT)research.att.com).
%E A001801 More terms from Michael Somos, Oct 25, 2002