Search: id:A002423
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%I A002423 M4934 N2114
%S A002423 1,14,70,140,70,28,28,40,70,140,308,728,1820,4760,12920,
%T A002423 36176,104006,305900,917700,2801400,8684340,27293640,86843400,
%U A002423 279409200,908079900,2978502072,9851968392,32839894640
%V A002423 1,-14,70,-140,70,28,28,40,70,140,308,728,1820,4760,12920,
%W A002423 36176,104006,305900,917700,2801400,8684340,27293640,86843400,
%X A002423 279409200,908079900,2978502072,9851968392,32839894640
%N A002423 Expansion of (1-4*x)^(7/2).
%D A002423 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002423 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002423 T. N. Thiele, Interpolationsrechnung. Teubner, Leipzig, 1909, p. 164.
%D A002423 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.
%F A002423 a(n) = sum[ m=0..n ] binomial(n, m) K_m(8), where K_m(x)=K_m(n, 2, x) 
               is a Krawtchouk polynomial - abarg(AT)research.bell-labs.com (Alexander 
               Barg).
%Y A002423 Cf. A007054, A004001, A002420, A002421-A002424, A007272.
%Y A002423 Sequence in context: A075480 A008354 A051879 this_sequence A034554 A034562 
               A041372
%Y A002423 Adjacent sequences: A002420 A002421 A002422 this_sequence A002424 A002425 
               A002426
%K A002423 sign,easy,nice
%O A002423 0,2
%A A002423 N. J. A. Sloane (njas(AT)research.att.com).

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