%I M3980 N1649 #23 May 08 2018 15:11:53
%S 5,35,1260,4620,30030,90090,1021020,2771340,14549535,37182145,
%T 1487285800,3650610600,17644617900,42075627300,396713057400,
%U 925663800600,4281195077775,9821565178425,178970743251300,405039050516100,1822675727322450,4079321865912150
%N Coefficients of Legendre polynomials.
%D 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 G. Prévost, Tables de Fonctions Sphériques. Gauthier-Villars, Paris, 1933, pp. 156-157.
%D N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H M. Abramowitz and I. A. Stegun, eds., <a href="http://www.convertit.com/Go/ConvertIt/Reference/AMS55.ASP">Handbook of Mathematical Functions</a>, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].
%o (PARI) a(n)= - polcoeff(pollegendre(n+6), n)*2^valuation((n\2*2+6)!, 2) \\ _Michel Marcus_, May 29 2013
%Y Diagonal 4 of triangle A100258.
%K nonn
%O 0,1
%A _N. J. A. Sloane_
%E More terms from _Michel Marcus_, Feb 02 2015