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 A111195 a(n) = 2^(-n)*Sum_{k=0..n} binomial(2*n+1,2*k+1)*A000364(k). 0
 1, 2, 5, 26, 269, 4666, 121017, 4370722, 209364537, 12833657010, 979336390669, 91018760056938, 10120101446389765, 1326280083965014634, 202311875122389093761, 35535622109342844729074 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS MATHEMATICA t = Range[0, 34]!CoefficientList[ Series[ Sec[x], {x, 0, 34}], x]; f[n_] := 2^(-n)*Sum [Binomial[2n + 1, 2k + 1]*t[[2k + 1]], {k, 0, n}]; Table[ f[n], {n, 0, 17}] (* Robert G. Wilson v *) CROSSREFS Cf. A103327, A000002. Sequence in context: A128595 A180749 A323299 * A323293 A258868 A322705 Adjacent sequences:  A111192 A111193 A111194 * A111196 A111197 A111198 KEYWORD easy,nonn AUTHOR Philippe Deléham, Oct 24 2005 EXTENSIONS More terms from Robert G. Wilson v, Oct 24 2005 STATUS approved

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Last modified June 4 04:39 EDT 2020. Contains 334815 sequences. (Running on oeis4.)