%I A001821 M5215 N2269
%S A001821 1,30,1023,44473,2475473,173721912,15088541896,1593719752240,
%T A001821 201529405816816,30092049283982400,5242380158902146624
%N A001821 Central factorial numbers.
%C A001821 a(n-3) is the coefficient of x^4 in Prod[k=0..n, x+k^2]. - R. Stephan, 
               Aug 22 2004
%D A001821 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A001821 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A001821 J. Riordan, Combinatorial Identities, Wiley, 1968, p. 217.
%Y A001821 Fourth right-hand column of triangle A008955.
%Y A001821 Sequence in context: A004994 A061466 A160313 this_sequence A027488 A075187 
               A060076
%Y A001821 Adjacent sequences: A001818 A001819 A001820 this_sequence A001822 A001823 
               A001824
%K A001821 nonn
%O A001821 0,2
%A A001821 N. J. A. Sloane (njas(AT)research.att.com).
%E A001821 More terms from R. Stephan, Aug 22 2004