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 A076687 Coefficients in asymptotic (divergent) expansion for sum(k=1,1/C(n,k)^2). 0
 1, 0, 4, 8, 48, 232, 1424, 9528, 71200, 583304, 5205744, 50248408, 521577152, 5792927016, 68544862864, 860781033848, 11433657374304, 160156668416968, 2359386578971184, 36466045448577048, 590001773395565056, 9972816169903366760, 175784744320988785104, 3225578298178782273208, 61520332394775552187808, 1217831035049931811657992, 24987953338088536137415024, 530772306056138891671901528, 11657753835270778957555056960 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS A005649 gives asymptotic divergent expansion for sum(k=0,n,1/C(n,k)) LINKS FORMULA Sum(k=1, C(n, k)^-2) = 1/n^0 + 0/n^1 + 2/n^2 + 0/n^3 + 8/n^4 + 0/n^5 + 16/n^6 + 96/n^7..... EXAMPLE Sum(k=1,1000, 1/C(1000,k)^2) = 1.000002000008016096466.... CROSSREFS Cf. A005649. Sequence in context: A249572 A078236 A054881 * A045882 A051681 A267987 Adjacent sequences:  A076684 A076685 A076686 * A076688 A076689 A076690 KEYWORD nonn AUTHOR Benoit Cloitre, Oct 25 2002 EXTENSIONS Corrected and extended by Vladeta Jovovic, Oct 26 2007 STATUS approved

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