%I A002424 M5058 N2188
%S A002424 1,18,126,420,630,252,84,72,90,140,252,504,1092,2520,6120,
%T A002424 15504,40698,110124,305900,869400,2521260,7443720,22331160,
%U A002424 67964400,209556900,653817528,2062039896,6567978928,21111360840
%V A002424 1,-18,126,-420,630,-252,-84,-72,-90,-140,-252,-504,-1092,-2520,-6120,
%W A002424 -15504,-40698,-110124,-305900,-869400,-2521260,-7443720,-22331160,
%X A002424 -67964400,-209556900,-653817528,-2062039896,-6567978928,-21111360840
%N A002424 Expansion of (1-4*x)^(9/2).
%D A002424 A. Fletcher, J. C. P. Miller, L. Rosenhead and L. J. Comrie, An Index 
               of Mathematical Tables. Vols. 1 and 2, 2nd ed., Blackwell, Oxford 
               and Addison-Wesley, Reading, MA, 1962, Vol. 1, p. 55.
%D A002424 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002424 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002424 T. N. Thiele, Interpolationsrechnung. Teubner, Leipzig, 1909, p. 164.
%F A002424 a(n) = sum[ m=0..n ] binomial(n, m) K_m(10), where K_m(x)=K_m(n, 2, x) 
               is a Krawtchouk polynomial - abarg(AT)research.bell-labs.com (Alexander 
               Barg).
%Y A002424 Cf. A007054, A004001, A002420, A002421-A002423, A007272.
%Y A002424 Sequence in context: A037064 A077960 A107971 this_sequence A101378 A107417 
               A056125
%Y A002424 Adjacent sequences: A002421 A002422 A002423 this_sequence A002425 A002426 
               A002427
%K A002424 sign,easy,nice
%O A002424 0,2
%A A002424 N. J. A. Sloane (njas(AT)research.att.com).