OFFSET
1,1
EXAMPLE
Example: Legendre(12) = (676039x^12 - 1939938x^10 + 2078505x^8 - 1021020x^6 + 225225x^4 - 18018x^2 + 231)/1024, hence a(6) = -18018. - Neven Juric
PROG
(PARI) a(n) = polcoeff(pollegendre(2*n, x), 2)*2^valuation((2*n)!, 2) \\ Michel Marcus, May 29 2013
CROSSREFS
KEYWORD
sign
AUTHOR
Ralf Stephan, Nov 13 2004
EXTENSIONS
Definition corrected by Neven Juric, Jan 10 2009
STATUS
approved