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A024188 ((n+2)!/2)(1/3 - 1/4 + ... + c/(n+2)), where c = (-1)^(n+1). 1

%I

%S 1,1,17,42,654,2712,44568,264240,4721040,36694080,716523840,

%T 6917823360,147356496000,1703866752000,39427129728000

%N ((n+2)!/2)(1/3 - 1/4 + ... + c/(n+2)), where c = (-1)^(n+1).

%F a(n) = A024176(n)/2

%o (PARI) a(n) = (n+2)!*sum(x=1, n, (-1)^(x+1)/(x+2))/2 \\_Michel Marcus_, Mar 21 2013

%K nonn

%O 1,3

%A _Clark Kimberling_

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Last modified October 20 07:33 EDT 2019. Contains 328252 sequences. (Running on oeis4.)